5又2/7乘以5+4又5/7乘以9又2/3=?要简便运算,快!
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5又2/7×5+4又5/7×9又2/3
=37/7×5+33/7×29/3
=1/7×37×5+1/7×33×29/3
=1/7×(37×5+33×29/3)
=1/7×(37×5+11×29)
=1/7×504
=72
=37/7×5+33/7×29/3
=1/7×37×5+1/7×33×29/3
=1/7×(37×5+33×29/3)
=1/7×(37×5+11×29)
=1/7×504
=72
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