7.85×4.7+43×0.785+7.85的简便计算
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75+42×99.6 ×20 =75+84x996 =75+84x(1000-4) =75+84x1000-84x4 =75+84000-336 =83739
咨询记录 · 回答于2022-10-29
7.85×4.7+43×0.785+7.85的简便计算
答案78.5,简便计算。 7.85x4.7+43x0.785+7.85 =7.85x4.7+4.3x7.85+7.85 =7.85x(4.7+4.3+1) =7.85x10 =78.5
答案78.5,简便计算。 7.85x4.7+43x0.785+7.85 =7.85x4.7+4.3x7.85+7.85 =7.85x(4.7+4.3+1) =7.85x10 =78.5
运用乘法分配律的逆运算,axb+axc=ax(b+c)
75+42×99.6 ×20
75+42×99.6 ×20 =75+84x996 =75+84x(1000-6) =75+84x1000-84x6 =75+84000-504 =83571
不好意思,打错了,996=1000-4
75+42×99.6 ×20 =75+84x996 =75+84x(1000-4) =75+84x1000-84x4 =75+84000-336 =83739
75+42×99.6 ×20 =75+84x996 =75+84x(1000-4) =75+84x1000-84x4 =75+84000-336 =83739
正确答案83739
运用数学拆分的思想,996=1000-4