0.5x等于5.6解方程 3.2x-7.2 5.6 解方程

(0.4+0.5)x=7.20.9x=7.2x=7.2÷0.9x=8

解:x-0.5=5/6 x=5/6+0.5 x=5/6+1/2 x=8/6 即为所求.

0.8

55.6-5x=5.65x=55.6-5.65x=50 x=50÷5 x=10

x—0.5x=6 解:1x-0.5x=6(将x看成是1x)(1-0.5)x=0.6(合并同类项)0.5x=0.60.5x÷0.5=6÷0.5(等式两边同时乘(或除)相等的非零的数或式子,两边依然相等.) x=.

x-0.6x=5.6解 0.4x=5.6 x=5.6÷0.4 X=14

5x+0.6x=56(5+0.6)x=565.6x=56x=10

3x-5.8=4.2+0.5x 3x-0.5x=4.2+5.8 2.5x=10 x=4

(1)0.5x=6,0.5x÷0.5=6÷0.5,x=12;(2)27÷0.6x=30, 45x=30, 45x÷45=30÷45, x= 2 3 .

0.7x=5.6 x=5.6÷0.7=8 所以x=8