摘要:4.用简便方法计算23×9.9+23时.可以把算式变换成2.3× 9.9+2.3× . 也可把算式变换成23×9.9+2.3×
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计算:要有必要的解题过程哦!
(1)-4.3-(-6.3)+(-3)
(2)-3.5÷
×|-
|
(3)24×(-
+
-
)
(4)
+
-
(5)(-2)3-2×(-3)-(-1)2012
(6)99
×36(用简便方法计算)
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(1)-4.3-(-6.3)+(-3)
(2)-3.5÷
| 7 |
| 8 |
| 3 |
| 4 |
(3)24×(-
| 1 |
| 6 |
| 2 |
| 3 |
| 1 |
| 12 |
(4)
| 3 | -8 |
| 4 |
|
(5)(-2)3-2×(-3)-(-1)2012
(6)99
| 71 |
| 72 |
用简便方法计算.
(1)(-
+
-
+
)×(-24);
(2)(-3
)×(-7
)×
×
;
(3)49
×(-5);
(4)-3.14×35.2+6.28×(-23.3)-1.57×36.4.
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(1)(-
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 8 |
| 5 |
| 12 |
(2)(-3
| 1 |
| 5 |
| 2 |
| 7 |
| 21 |
| 51 |
| 25 |
| 16 |
(3)49
| 24 |
| 25 |
(4)-3.14×35.2+6.28×(-23.3)-1.57×36.4.
计算:
(1)[-22+(-2)3]-(-2)×(-3)
(2)(
+
-
)÷(-
)
(3)-1.6÷[(-
)2×(-3)3-22]
(4)-14+〔1-(1-0.5×2)〕÷|2-(-3)2|
(5)29
×(-5)(用简便方法计算,否则不得分)
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(1)[-22+(-2)3]-(-2)×(-3)
(2)(
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
| 1 |
| 36 |
(3)-1.6÷[(-
| 2 |
| 3 |
(4)-14+〔1-(1-0.5×2)〕÷|2-(-3)2|
(5)29
| 14 |
| 15 |