15×31/42+15/42×50+15÷42简便计算
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15×31/42+15/42×50+15÷42
=31×15/42+15/42×50+15/42
=15/42×(31+50+1)
=15/42×82
=15/42×(84-2)
=30-5/7
=29又2/7
=31×15/42+15/42×50+15/42
=15/42×(31+50+1)
=15/42×82
=15/42×(84-2)
=30-5/7
=29又2/7
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