X=25/28+3/4X=25/28+21/28X=46/28X=1*9/14
X=25/28+4/3X=25/28+21/28X=46/28(分子分母同除公因数4)X=12/7
x-3/4=25/28x=25/28+3/4x=25/28+21/28x=46/28x=23/14
X=25/28+3/4X=25/28+21/28X=46/28X=23/14