=分数,/上面是分子:31又1/2乘2/3加41又1/3乘3/4加51又1/4乘4/5加61又1/5乘5/6加71又1/6乘6/7简便计算

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/25 13:28:01
=分数,/上面是分子:31又1/2乘2/3加41又1/3乘3/4加51又1/4乘4/5加61又1/5乘5/6加71又1/6乘6/7简便计算
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=分数,/上面是分子:31又1/2乘2/3加41又1/3乘3/4加51又1/4乘4/5加61又1/5乘5/6加71又1/6乘6/7简便计算
=分数,/上面是分子:31又1/2乘2/3加41又1/3乘3/4加51又1/4乘4/5加61又1/5乘5/6加71又1/6乘6/7
简便计算

=分数,/上面是分子:31又1/2乘2/3加41又1/3乘3/4加51又1/4乘4/5加61又1/5乘5/6加71又1/6乘6/7简便计算
原式=(30+3/2)×2/3+(40+4/3)×3/4+(50+5/4)×4/5+(60+6/5)×5/6+(70+7/6)×6/7
=20+1+30+1+50+1+60+1+70+1
=100+130+5
=235