Question

0.3x－0.25x=21.15－7x 解方程？

Answer 1

7x+0.3x-0.25x=21.15

7.05x=21.15

x=21.15÷7.05

x=3,1,0.05x=14.15,,x=283,2,3,1,0.3x-x×0.25=21.15-7x
0.3x-0.25x=21.15-7x
0.5x=21.15-7x
0.5x+7x=21.15
7.5x=21.15
x=21.15÷7.5
x=2.82
这里涉及到“两边都有x的方程”问题，解的时候需要变号。,1,懒人的最高境界啊，我服了。,1,-6.5x＝搭穗燃知虚21.75,0,等于族乎2.82,0,3,0,3,0,