解方程0.6x+(20
0.6x+(20-x)*0.8=13.6怎么解
0.6x+(20-x)*0.8=13.6 解：0.6x+16-0.8x=13.6→→→乘法分配律 16-0.2x=13.6 16-0.2x+0.2x-13.6=13.6+0.2x-13.6→→→两边同时加0.2x-13.6 2.4=0.2x 0.2x÷0.2=2.4÷0.2→→→等式两边同时除以0.2 x=12