3X+8=2X+12 25%X+4.2=15%x+1.8 (1+15%)X-25%X=0.81
问题描述:
3X+8=2X+12 25%X+4.2=15%x+1.8 (1+15%)X-25%X=0.81
答
3X+8=2X+12 x=4
25%X+4.2=15%x+1.8 0.25x-0.15x=1.8-4.2 0.1x=-2.4 x=-24
(1+15%)X-25%X=0.81 1.15x-0.25x=0.81 0.9x=0.81 x=0.9
答
3X+8=2X+12
x=4
25%X+4.2=15%x+1.8
0.1x=-2.4
x=-24
(1+15%)X-25%X=0.81
0.9x=0.81
x=0.9
答
3X+8=2X+12
x=12-8=4;
25%X+4.2=15%x+1.8
0.1x=-2.4;
x=-24;
(1+15%)X-25%X=0.81
0.9x=0.81;
x=0.9