题目内容
【题目】脱式计算,能简算的要简算。
2.5×5.18×4 10.1×87
0.38×56+1.2×5.6 [8.3-(3.6+2.9)]÷0.72
【答案】51.8;878.7;
28;2.5
【解析】
2.5×5.18×4
=2.5×4×5.18
=10×5.18
=51.8
10.1×87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7
0.38×56+1.2×5.6
=3.8×5.6+1.2×5.6
=5.6×(3.8+1.2)
=5.6×5
=28
[8.3-(3.6+2.9)]÷0.72
=[8.3-6.5]÷0.72
=1.8÷0.72=2.5
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