题目内容
计算题
(1)8+(-
)-(-0.25)
(2)(-4
)÷(-10)×(3
)÷(-2
)
(3)99.9×(-3)(用简便方法计算)
(4)4-(-2)3-32÷(-1)
(1)8+(-
| 1 |
| 4 |
(2)(-4
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
(3)99.9×(-3)(用简便方法计算)
(4)4-(-2)3-32÷(-1)
(1)8+(-
)-(-0.25)
=8+0
=8;
(2)(-4
)÷(-10)×(3
)÷(-2
)
=-
×
×
×
=-
;
(3)99.9×(-3)
=(100-0.1)×(-3)
=100×(-3)-0.1×(-3)
=-300+0.3
=-299.7;
(4)4-(-2)3-32÷(-1)
=4+8+9÷1
=4+8+9
=21.
| 1 |
| 4 |
=8+0
=8;
(2)(-4
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
=-
| 9 |
| 2 |
| 1 |
| 10 |
| 10 |
| 3 |
| 2 |
| 5 |
=-
| 3 |
| 5 |
(3)99.9×(-3)
=(100-0.1)×(-3)
=100×(-3)-0.1×(-3)
=-300+0.3
=-299.7;
(4)4-(-2)3-32÷(-1)
=4+8+9÷1
=4+8+9
=21.
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