14×5-3x=25 5x-0.5×8=0 (8-1.2)x=6.8 (1-37.5%)x=62.5 9x-16
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/10/04 15:33:09
14×5-3x=25 | 5x-0.5×8=0 | (8-1.2)x=6.8 |
(1-37.5%)x=62.5 | 9x-
(1)14×5-3x=25,70-3x=25, 70-3x+3x=25+3x, 3x+25=70, 3x+25-25=70-25, 3x=45, 3x÷3=45÷3, x=15; (2)5x-0.5×8=0, 5x-4=0, 5x-4+4=0+4, 5x=4, 5x÷5=4÷5, x=0.8, (3)(8-1.2)x=6.8, 6.8x=6.8, 6.8x÷6.8=6.8÷6.8, x=1; (4)(1-37.5%)x=62.5, 0.625x=62.5, 0.625x÷0.625=62.5÷0.625, x=100; (5)9x- 1 6= 5 6, 9x- 1 6+ 1 6= 5 6+ 1 6, 9x=1, 9x÷9=1÷9, x= 1 9; (6) 3 4x-5%=17.5, 3 4x-5%+5%=17.5-5%, 3 4x=17.45; 3 4x÷ 3 4=17.45÷ 3 4, x= 349 15.
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