3x-60%x=288 |
(1)3x-60%x=288, 2.4x=288, 2.4x÷2.4=288÷2.4, x=120; (2) 1 2− 1 3x= 1 5, 1 2− 1 3x+ 1 3x= 1 5+ 1 3x, 1 2− 1 5= 1 5+ 1 3x- 1 5, 3 10= 1 3x, 3 10÷ 1 3= 1 3x÷ 1 3, x= 9 10; (3) 4 5x-0.48=1.2,
4 5x-0.48+0.48=1.2+0.48, 4 5x=1.68, 4 5x÷ 4 5=1.68÷ 4 5, x=2.1.
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