挑战习题
1
/5
单选题
难度:
1.下列各式计算正确的是()
A
(-3)×(-2)=-6
B
(-4)×(-3)×(-5)=-60
C
-8×7+(-2)×7+(-5)×0=0
D
提示1:
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正确答案:
Qg==
QS7ljp/lvI89Nu+8jEIu5q2j56Gu77yMQy7ljp/lvI89KC04LTIpw5c3PS03MO+8jEQu566A5L6/566X5rOV77yM5bqU55So5LmY5rOV5YiG6YWN5b6L77ya5Y6f5byPPTxpbWcgd2lkdGg9MjI3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzNFL0IwL3JCQUNKbFRJb3k3RGptYXFBQUFEcHVSWDJBSTQzOC5wbmciPu+8jOaVhemAiUI=
2
/5
单选题
难度:
2.在算式(-57)×24+36×24-79×24=(-57+36-79)×24中,这里应用了()
A
加法交换律
B
乘法交换律
C
乘法结合律
D
乘法分配律
提示1:
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正确答案:
RA==
5LmY5rOV5YiG6YWN5b6L77yaYShiK2MpPWFiK2FjLOS5mOazleWIhumFjeW+i+mAhueUqO+8jOaVhemAiUQ=
3
/5
单选题
难度:
3.如果(a-2)(b-3)=0,那么一定有()
A
a=2
B
b=3
C
a=2或b=3
D
a=2且b=3
提示1:
5pyJ55CG5pWw5LmY5rOV5rOV5YiZ
正确答案:
Qw==
5Lu75L2V5pWw5LiO6Zu255u45LmY77yM6YO95b6XMC48YnI+4oi177yIYS0y77yJ77yIYi0z77yJPTDvvIw8YnI+4oi0YS0y5oiWYi0z5Li6MO+8jOWNs2E9MuaIlmI9M++8jOmAiUQ=
4
/5
单选题
难度:
4.下列各式中,计算结果为负数的是 ()
A
(-3)×(-4)×6.2
B
|-3|×|-4|×(-5.5)×(-3)
C
(-13)×(-40)×(-99.8)
D
(-15)×|-87|×0
提示1:
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提示2:
5pyJ55CG5pWw5LmY5rOV77yM56ym5Y+35rOV5YiZ
正确答案:
Qw==
Qe+8jui0n8OX6LSfw5fmraM95q2j77yMPGJyPkIu5q2jw5fmraPDl+i0n8OX6LSfPeato++8jDxicj5DLiDotJ/Dl+i0n8OX6LSfPei0n++8jDxicj5ELuWHoOS4quaVsOebuOS5mO+8jOWmguaenOWFtuS4reacieWboOaVsOS4ujDvvIzpgqPkuYjnp6/nrYnkuo4wLuaVhemAiUM=
5
/5
单选题
难度:
5.计算
的结果是()
A
-2
B
-3
C
-4
D
-5
提示1:
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正确答案:
RA==
5Y6f5byPPTxpbWcgd2lkdGg9NDcxIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzNFL0VGL3JCQUNKMVRJb3pLZ19QeEdBQUFGWldmVUhkczIzOS5wbmciPkTjgII=