题目内容
脱式计算(能简算的药简算)
| 12.5×0.4×2.5×8 | 0.87×6.6+8.7×0.34 | 9.07-22.78÷3.4. |
(1)12.5×0.4×2.5×8,
=(12.5×8)×(0.4×2.5),
=100×1,
=100;
(2)0.87×6.6+8.7×0.34,
=0.87×6.6+0.87×10×0.34,
=0.87×6.6+0.87×3.4,
=0.87×(6.6+3.4),
=0.87×10,
=8.7;
(3)9.07-22.78÷3.4,
=9.07-6.7,
=2.37.
=(12.5×8)×(0.4×2.5),
=100×1,
=100;
(2)0.87×6.6+8.7×0.34,
=0.87×6.6+0.87×10×0.34,
=0.87×6.6+0.87×3.4,
=0.87×(6.6+3.4),
=0.87×10,
=8.7;
(3)9.07-22.78÷3.4,
=9.07-6.7,
=2.37.
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