0.6X+(20-X)0.8=13.6怎么解

0.6X+(20-X)0.8=13.6怎么解
0.6X+(20-X)0.8=13.6怎么解

0.6X+(20-X)0.8=13.6怎么解
0.6X+(20-X)0.8=13.6
0.6X+20*0.8-0.8X=13.6
16-0.2X=13.6
0.2X=2.4
X=12

原式等于 0.6X+16-0.8X=13.6
即 16-13.6=0.8X-0.6X
2.4=0.2X
解得 X=12

0.6X+(20-X)0.8=13.6
0.6X+16-0.8X=13.6
0.8X-0.6X=16-13.6
0.2X=2.4
X=2.4÷0.2
X=12

0.6X+(20-X)0.8=13.6
0.6X+16-0.8X=13.6
0.2X=2.4
x=12

0.6X+(20-X)0.8=13.6
0.6X+16-0.8X=13.6
-0.2X=-2.4
X=12

0.6X+(20-X)0.8=13.6
0.6X+16-0.8X=13.6
0.6X-0.8X=13.6-16
-0.2X=-2.4
X=-2.4/-0.2
X=12

0.6X+(20-X)0.8=13.6
0.6X+20*0.8-0.8X=13.6
16-0.2X=13.6
0.2X=2.4
X=12

等式两边同时乘以10,再去括号,合并即可得x=12