
计算下面各题(1)3×(-5)+(-28)÷7(2)?16?(?5)+23?|?12|(3)2×(-2)3-4×(-3)+15÷3(4)(?3
计算下面各题(1)3×(-5)+(-28)÷7(2)?16?(?5)+23?|?12|(3)2×(-2)3-4×(-3)+15÷3(4)(?34?59+712)÷136...
计算下面各题(1)3×(-5)+(-28)÷7(2)?16?(?5)+23?|?12|(3)2×(-2)3-4×(-3)+15÷3(4)(?34?59+712)÷136
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①原式=-15+(-4)
=-(15+4)
=-19;
②原式=?16+5+23?
=12?
=11.5;
③原式=2×(-8)-(-12)+5
=-16+12+5
=1;
④原式=(?
?
+
)×36
=?
×36?
×36+
×36
=-3×9-5×4+7×3
=-27-20+21
=-26.
=-(15+4)
=-19;
②原式=?16+5+23?
1 |
2 |
=12?
1 |
2 |
=11.5;
③原式=2×(-8)-(-12)+5
=-16+12+5
=1;
④原式=(?
3 |
4 |
5 |
9 |
7 |
12 |
=?
3 |
4 |
5 |
9 |
7 |
12 |
=-3×9-5×4+7×3
=-27-20+21
=-26.
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