题目内容
计算下列各题(能用运算律用运算律)
(1)8+(-
)-5-(-0.25)
(2)19
×(-5)
(3)-32-|(-5)3|×(-
)2-18÷|-(-3)2|-31.
(4)-3.375×12+4.375×12-36×(
-
+
).
(1)8+(-
1 |
4 |
(2)19
16 |
17 |
(3)-32-|(-5)3|×(-
2 |
5 |
(4)-3.375×12+4.375×12-36×(
1 |
18 |
1 |
12 |
1 |
3 |
(1)8+(-
)-5-(-0.25)=8-
-5+
=3;
(2)19
×(-5)=(19+
)×(-5)=-95-
=-99
;
(3)-32-|(-5)3|×(-
)2-18÷|-(-3)2|-31
=-9-125×
-18÷9-31
=-9-20-2-31
=-62;
(4)-3.375×12+4.375×12-36×(
-
+
)
=12×(4.375-3.375)-2+3-12
=12-2+3-12
=1.
1 |
4 |
1 |
4 |
1 |
4 |
(2)19
16 |
17 |
16 |
17 |
80 |
17 |
12 |
17 |
(3)-32-|(-5)3|×(-
2 |
5 |
=-9-125×
4 |
25 |
=-9-20-2-31
=-62;
(4)-3.375×12+4.375×12-36×(
1 |
18 |
1 |
12 |
1 |
3 |
=12×(4.375-3.375)-2+3-12
=12-2+3-12
=1.
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