5分之4x加2分之1x=26(5分之4+2分之1)x=261.3x=2.6x=26÷1.3x=20
5分之4x + 2分之1x = 26 0.8x + 0.5x = 261.3x = 26x = 26 ÷ 1.3x = 20
x＝20
