1 bÀi tẬp mỆnh ĐỀ
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dai soTRANSCRIPT
(1
BI TP MNH
Bai 1. Trong cc cu di y, cu no l mnh , cu no l mnh cha bin:
a) S 11 l s chn.
b) Bn c chm hc khng ?
c) Hu l mt thnh ph ca Vit Nam.
d) 2x + 3 l mt s nguyn dng.
e) .
f) 4 + x = 3.
g) Hy tr li cu hi ny!.
h) Paris l th nc .
i) Phng trnh c nghim.k) 13 l mt s nguyn t.
Bai 2. Trong cc mnh sau, mnh no l ng ? Gii thch ?
a) Nu a chia ht cho 9 th a chia ht cho 3.b) Nu th .
c) Nu a chia ht cho 3 th a chia ht cho 6.d) S ln hn 2 v nh hn 4.
e) 2 v 3 l hai s nguyn t cng nhau.
f) 81 l mt s chnh phng.
g) 5 > 3 hoc 5 < 3.
h) S 15 chia ht cho 4 hoc cho 5.
Bai 3. Trong cc mnh sau, mnh no l ng ? Gii thch ?
a) Hai tam gic bng nhau khi v ch khi chng c din tch bng nhau.
b) Hai tam gic bng nhau khi v ch khi chng ng dng v c mt cnh bng nhau.
c) Mt tam gic l tam gic u khi v ch khi chng c hai ng trung tuyn bng nhau v c mt gc bng .
d) Mt tam gic l tam gic vung khi v ch khi n c mt gc bng tng ca hai gc cn li.
e) ng trn c mt tm i xng v mt trc i xng.
f) Hnh ch nht c hai trc i xng.
g) Mt t gic l hnh thoi khi v ch khi n c hai ng cho vung gc vi nhau.
h) Mt t gic ni tip c ng trn khi v ch khi n c hai gc vung.
Bai 4. Trong cc mnh sau, mnh no l ng ? Gii thch ? Pht biu cc mnh thnh li:
a) .
b)
c) .
d) .
e) f)
g) .h)
i)
EMBED Equation.DSMT4
k) l hp s.
l) khng chia ht cho 3.
m) l s l.
n) chia ht cho 6.
Bai 5. in vo ch trng t ni "v" hay "hoc" c mnh ng:
a) .
b) .
c)
d) .
e) Mt s chia ht cho 6 khi v ch khi n chia ht cho 2 . cho 3.
f) Mt s chia ht cho 5 khi v ch khi ch s tn cng ca n bng 0 . bng 5.
Bai 6. Cho mnh cha bin P(x), vi x ( R. Tm x P(x) l mnh ng:
a)
b)
c)
d)
e)
f)
Bai 7. Nu mnh ph nh ca cc mnh sau:
a) S t nhin n chia ht cho 2 v cho 3.
b) S t nhin n c ch s tn cng bng 0 hoc bng 5.
c) T gic T c hai cnh i va song song va bng nhau.
d) S t nhin n c c s bng 1 v bng n.
Bai 8. Nu mnh ph nh ca cc mnh sau:
a)
.
b) .
c) .
d) .
e) .
f) .
g) khng chia ht cho 3.h) l s nguyn t.
i) chia ht cho 2.
k) l s l.
Bai 9. Pht biu cc mnh sau, bng cch s dng khi nim "iu kin cn", "iu kin ":
a) Nu mt s t nhin c ch s tn cng l ch s 5 th n chia ht cho 5.
b) Nu th mt trong hai s a v b phi dng.
c) Nu mt s t nhin chia ht cho 6 th n chia ht cho 3.
d) Nu th .
e) Nu a v b cng chia ht cho c th a + b chia ht cho c.
Bai 10. Pht biu cc mnh sau, bng cch s dng khi nim "iu kin cn", "iu kin ":
a) Trong mt phng, nu hai ng thng phn bit cng vung gc vi mt ng thng th ba th hai ng thng y song song vi nhau.
b) Nu hai tam gic bng nhau th chng c din tch bng nhau.
c) Nu t gic T l mt hnh thoi th n c hai ng cho vung gc vi nhau.
d) Nu t gic H l mt hnh ch nht th n c ba gc vung.
e) Nu tam gic K u th n c hai gc bng nhau.
Bai 11. Pht biu cc mnh sau, bng cch s dng khi nim "iu kin cn v ":
a) Mt tam gic l vung khi v ch khi n c mt gc bng tng hai gc cn li.
b) Mt t gic l hnh ch nht khi v ch khi n c ba gc vung.
c) Mt t gic l ni tip c trong ng trn khi v ch khi n c hai gc i b nhau.
d) Mt s chia ht cho 6 khi v ch khi n chia ht cho 2 v cho 3.
e) S t nhin n l s l khi v ch khi l s l.
Bai 12. Chng minh cc mnh sau bng phng php phn chng:
a) Nu th mt trong hai s a v b nh hn 1.
b) Mt tam gic khng phi l tam gic u th n c t nht mt gc nh hn .
c) Nu v th .
d) Nu bnh phng ca mt s t nhin n l mt s chn th n cng l mt s chn.
e) Nu tch ca hai s t nhin l mt s l th tng ca chng l mt s chn.
f) Nu mt t gic c tng cc gc i din bng hai gc vung th t gic ni tip c ng trn.
g) Nu th x = 0 v y = 0.(2
BI TP TP HPBai 1. Vit mi tp hp sau bng cch lit k cc phn t ca n:
A =
B =
C =
D =
E =
F =
G =
H =
Bai 2. Vit mi tp hp sau bng cch ch r tnh cht c trng cho cc phn t ca n:
A =
B =
C =
D =
E =
F =
G = Tp tt c cc im thuc ng trung trc ca on thng AB.
H = Tp tt c cc im thuc ng trn tm I cho trc v c bn knh bng 5.
Bai 3. Trong cc tp hp sau y, tp no l tp rng:
A =
B =
C =
D =
E =
F =
Bai 4. Tm tt c cc tp con, cc tp con gm hai phn t ca cc tp hp sau:
A =
B =
C =
D =
E =
Bai 5. Trong cc tp hp sau, tp no l tp con ca tp no?
a) A = ,B = ,C = ,D = .
b) A = Tp cc c s t nhin ca 6 ;B = Tp cc c s t nhin ca 12.
c) A = Tp cc hnh bnh hnh;
B = Tp cc hnh ch nht;
C = Tp cc hnh thoi;
D = Tp cc hnh vung.
d) A = Tp cc tam gic cn;
B = Tp cc tam gic u;
C = Tp cc tam gic vung;
D = Tp cc tam gic vung cn.
Bai 6. Tm A ( B, A ( B, A \ B, B \ A vi:
a) A = {2, 4, 7, 8, 9, 12}, B = {2, 8, 9, 12}
b) A = {2, 4, 6, 9}, B = {1, 2, 3, 4}
c) A = , B = .
d) A = Tp cc c s ca 12, B = Tp cc c s ca 18.
e) A = , B = Tp cc s nguyn t c mt ch s.
f) A = , B = .
g) A = , B = .
Bai 7. Tm tt c cc tp hp X sao cho:
a) {1, 2} ( X ( {1, 2, 3, 4, 5}.
b) {1, 2} ( X = {1, 2, 3, 4}.
c) X ( {1, 2, 3, 4}, X ( {0, 2, 4, 6, 8}d)
Bai 8. Tm cc tp hp A, B sao cho:
a) A(B = {0;1;2;3;4}, A\B = {3; 2}, B\A = {6; 9; 10}.
b) A(B = {1;2;3}, A\B = {4; 5}, B\A = {6; 9}.
Bai 9. Tm A ( B, A ( B, A \ B, B \ A vi:
a) A = [4; 4], B = [1; 7]
b) A = [4; 2], B = (3; 7]
c) A = [4; 2], B = (3; 7)
d) A = ((; 2], B = [3; +()
e) A = [3; +(), B = (0; 4)
f) A = (1; 4), B = (2; 6)
Bai 10. Tm A ( B ( C, A ( B ( C vi:
a) A = [1; 4], B = (2; 6), C = (1; 2)b) A = ((; 2], B = [3; +(), C = (0; 4)
c) A = [0; 4], B = (1; 5), C = (3; 1]d) A = ((; 2], B = [2; +(), C = (0; 3)
e) A = (5; 1], B = [3; +(), C = ((; 2)
Bai 11. Chng minh rng:
a) Nu A ( B th A ( B = A.
b) Nu A ( C v B ( C th (A ( B) ( C.
c) Nu A ( B = A ( B th A = B
d) Nu A ( B v A ( C th A ( (B ( C).
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