简便运算题7/29×3/8+6/29×7/12+3/29×7/9的简便运算...急...

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简便运算题7/29×3/8+6/29×7/12+3/29×7/9的简便运算...急...简便运算题7/29×3/8+6/29×7/12+3/29×7/9的简便运算...急...简便运算题7/29×3/

简便运算题7/29×3/8+6/29×7/12+3/29×7/9的简便运算...急...
简便运算题
7/29×3/8+6/29×7/12+3/29×7/9的简便运算...急...

简便运算题7/29×3/8+6/29×7/12+3/29×7/9的简便运算...急...
7/29×3/8+6/29×7/12+3/29×7/9
=7/29*(3/8+6/12+3/9)
=7/29*(3/8+1/2+1/3)
=7/29*(3/8+5/6)
=7/29*(29/24)
=7/24

7/29×3/8+6/29×7/12+3/29×7/9
=7/29×3×(1/8+2/12+1/9)
=21/29×(1/8+2/12+1/9)
=21/29×29/72
=21/72
=7/24

7/29×3/8+6/29×7/12+3/29×7/9
=7/29×3/8+7/29×6/12+7/29×3/9
=7/29×(3/8+6/12+3/9)
=7/29×(3/8+1/2+1/3)
=7/29×(9/24+12/24+8/24)
=7/29×29/24
=7/24

=7/29*(3/8+1/2+1/3)
=7/29*29/24
=7/24
这种题你想尽办法拆分母就是了

把7/29提出来即7/29*(3/8+6/12+3/9)=7/24