数学 面粉5公斤,做饼用去10分之1,做蛋糕用去5分之2,共用去面粉多少公斤?
回答 (3)
2007-06-13 4:24 am
共用去面粉:
5*1/10+5*2/5
=5/10+2
=2又5/10
=2又1/2
=2.5(kg)
5*1/10+5*2/5
=5/10+2
=2又5/10
=2又1/2
=2.5(kg)
2007-06-12 7:17 pm
面粉5公斤,做饼用去10分之1
= 5 x 1/10
= 0.5 Kg
做蛋糕用去5分之2
=5 x 2/5
= 2 Kg
共用去面粉多少公斤?
= 2 + 0.5 Kg
=2.5 Kg
= 5 x 1/10
= 0.5 Kg
做蛋糕用去5分之2
=5 x 2/5
= 2 Kg
共用去面粉多少公斤?
= 2 + 0.5 Kg
=2.5 Kg
參考: me
2007-06-12 7:08 pm
总共用去
5X1/10+5X2/5
=1/2+2
=2.5KG
QED
5X1/10+5X2/5
=1/2+2
=2.5KG
QED
收錄日期: 2021-04-25 20:16:54
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