(1)4分之3x - 5分之2x =8分之17x/20=1/8x=1/8*20/7x=5/14(2)3分之2x ÷ 4分之1 =123分之2x =12*4分之1x =3*3/2x=9/2 如有帮助,请采纳。谢谢
(1)3x/4- 2x/5 =7/8(小先通分)7x/20=7/856x=140x=2.5 (2)2x/3 ÷ 1/4 =122x/3=12×1/42x/3=32x=9x=9/2x=4.5