5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2)/2=71 方程解
问题描述:
5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2)/2=71 方程解
答
5x=25*4-15x
5x+15x=100
20x=100
x=5
7x-x+2*3=29.4
6x=23.4
x=3.9
(28.8+5.5x+3.2)/2=71
5.5x+32=142
5.5x=110
x=20再问你一题,(82+x-19)/3=24x+63=72x=72-63x=9