(1)30%x=120, 30%x÷30%=120÷30%, x=400; (2)x+35%x=240, 1.35x=240, 1.35x÷1.35=240÷1.35, x=
(3)30x-60%x=160, 0.4x=160, 0.4x÷0.4=160÷0.4, x=400; (4)50%x-33%x=34, 17%x=34, 17%x÷17%=34÷17%, x=200; (5)120x-20x=40, 100%x=40, x=40; (6)x+130% x=460, 2.3x=460, 2.3x÷2.3=460÷2.3, x=200. |