解方程: (1)(x-2):
(2)(x+0.3):0.7=13:7. |
(1)(x-2):
=x:22 3
x=2×(x-2),2 3
x+4=2x-4+4,2 3
x+4-2 3
x=2x-2 3
x,2 3
4÷1
=11 3
x÷11 3
,1 3
x=3;
(2)(x+0.3):0.7=13:7,
7×(x+0.3)=0.7×13,
7x+2.1-2.1=9.1-2.1,
7x÷7=7÷7,
x=1.