作业帮4.2×1.2-5.2×0.7如何简算
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/14 11:17:30
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4.2×1.2-5.2×0.7如何简算
4.2×1.2-5.2×0.7如何简算
4.2×1.2-5.2×0.7如何简算
4.2×1.2-5.2×0.7
=(5.2-1)×1.2- 5.2×0.7
=5.2×1.2-1.2-5.2×0.7
=5.2×1.2-5.2×0.7-1.2
=5.2×(1.2-0.7)-1.2
=5.2×0.5-1.2
=2.6-1.2
=1.4
4.2×1.2-5.2×0.7
=6*0.7*1.2-5.2*0.7
=0.7*（7.2-5.2）
=0.7*2
=1.4
4.2×1.2-5.2×0.7=0.7*6×1.2-5.2×0.7=0.7*×7.2-5.2×0.7=0.7*[7.2-5.2]=1.4
4.2×1.2-5.2×0.7
=0.7×6×1.2-5.2×0.7
=0.7×7.2-5.2×0.7
=0.7×（7.2-5.2）
=1.4
4.2*1.2-5.2*0.7
=6*0.7*0.4*3-0.4*13*0.7
=0.7*0.4(6*3-13)=0.28*5=1.4 (关键是找它们的公因式）
4.2×1.2-5.2×0.7
=0.7x6x1.2-5.2x0.7
=0.7x(6x1.2-5.2)
=0.7x(6x0.4x3-0.4x13)
=0.7x0.4x(6x3-13)
=0.7x0.4x5
=0.7x2
=1.4
总之就是要找到可以使式子中有公因子的分解方法，找最好计算的合并起来
4.2×1.2-5.2×0.7
=0.7×6×1.2-5.2×0.7
=0.7×7.2-5.2×0.7
=0.7×（7.2-5.2）
=1.4