(x-8分之5x)乘8=15乘88x-5x=1203x=120x=40
解: x-5/8x=15(1-5/8)x=15 3/8x=15 x=15*8/3 x=40
x-5x/8=158x/8-5x/8=15(8x-5x)/8=153x/8=153x=15*8x=15*8/3=5*8=40
X(3/8)=15X=40
X-5/8X=15(1-5/8)x=153/8x=15x=15*8/3x=40