问题 解答题
计算:
(1)-100+157;
(2)-18+(-32);
(3)-9-27;
(4)-29-(-12);
(5)-8×(-15);
(6)(-4)÷(-
1
4
);
(7)-5.6÷(-8);
(8)72÷(-
1
3
);
(9)(-0.03)×(-100);
(10)(-0.03)÷(-0.01);
(11)3.2÷(-1
3
5
);
(12)(-0.75)÷(-5
5
8
).
答案

(1)原式=57;

(2)原式=-18-32=-50;

(3)原式=-36;

(4)原式=-29+12=-17;

(5)原式=120;

(6)原式=4×4=16;

(7)原式=5.6×

1
8
=0.7;

(8)原式=72×(-3)=-216;

(9)原式=3;

(10)原式=3;

(11)原式=

16
5
×(-
5
8
)=-2;

(12)原式=

3
4
×
8
45
=
2
15

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