计算下列各题:(1)2×(-5)+23-3÷12 (2)22...
计算下列各题:(1)2×(-5)+23-3÷12(2)22+|-1|-9(3)(-58)×(-42)-0.25×(-5)×(-4)3-3-1000....
计算下列各题:(1)2×(-5)+23-3÷12 (2)22+|-1|-9(3)(-58)×(-42)-0.25×(-5)×(-4)3-3-1000.
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(1)2×(-5)+23-3÷
=2×(-5)+8-3×2
=-10+8-6
=-2+(-6)
=-8;
(2)22+|-1|-
=4+1-3
=5-3
=2;
(3)(-
)×(-42)-0.25×(-5)×(-4)3-
=(-
)×(-16)-
×(-5)×(-64)-(-10)
=10-80+10
=20-80
=-60.
| 1 |
| 2 |
=2×(-5)+8-3×2
=-10+8-6
=-2+(-6)
=-8;
(2)22+|-1|-
| 9 |
=4+1-3
=5-3
=2;
(3)(-
| 5 |
| 8 |
| 3 | -1000 |
=(-
| 5 |
| 8 |
| 1 |
| 4 |
=10-80+10
=20-80
=-60.
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