详细步骤看图
4/5-1/8X=5/8解：1/8X=4/5-5/8 1/8X=32/40-25/40 1/8X=7/40 X=7/40÷1/8 X=7/40x8 X=7/5
x等于27分之25
4/5-x/8=5/8x/8=4/5-5/8x=32/5-5x=7/5
