4.6×0.8+0.2×7.6简便计算过程

Question

4.6×0.8+0.2×7.6简便计算过程

Answer 1

解：原式=4.6x0.8+0.8x1.9
=0.8x（4.6+1.9）
=0.8x6.5
=5.2
分析：主要考查拆分法和提取公因式的简便方法。

Answer 2

4.6×0.8+0.2×7.6
=4.6×0.8+0.2×4x1.9
=0.8x（4.6+1.9）
=0.4x2x6.5
=0.4x13
=5.2
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Answer 3

4.6×0.8+0.2×7.6
=4.6×0.8+0.2×4.6 + 0.2x3
=4.6x(0.8+0.2) +0.6
=4.6x1 +0.6
=4.6+0.6
=5.2

Answer 4

4*0.8+0.6*0.8+7*0.2+0.6*0.2
=4*0.8+4*0.2+3*0.2+0.6*（0.8*0.2）
=4+0.6+0.6

Answer 5

（5-0.4）x0.8+0.2（8-0.4）
=4-0.32+1.6-0.08
=4-0.4+1.6
=5.2