1/3x+1/4x=21怎么解
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1/3x+1/4x=21怎么解1/3x+1/4x=21怎么解1/3x+1/4x=21怎么解1/3x+1/4x=21(1/3+1/4)x=21(4/12+3/12)x=217x/12=217x=12*2
1/3x+1/4x=21怎么解
1/3x+1/4x=21怎么解
1/3x+1/4x=21怎么解
1/3x+1/4x=21
(1/3+1/4)x=21
(4/12+3/12)x=21
7x/12=21
7x=12*21
7x=252
x=252/7