解方程
3(x-3.5)=19.8
|
(1)
:1 4
=8:x1 12
x=1 4
×81 12
x÷1 4
=1 4
÷2 3 1 4
x=2
;2 3
(2)3(x-3.5)=19.8
3(x-3.5)÷3=19.8÷3
x-3.5+3.5=6.6+3.5
x=10.1;
(3)
-3x=0.54 5
-3x+3x=0.5+3x4 5
-0.5=0.5+3x-0.54 5
0.3÷3=3x÷3x
x=0.1;
(4)
:X=3 4
:30%2 5
x=2 5
×30%3 4
x÷2 5
=2 5
÷9 40 2 5
x=
.9 16