问题 解答题
解方程.
9x+17.2=57.7
6.7x+2.2x=93.45
X÷6.5=7.618(x+0.9)=22.5
4×2.3+2x=9.82(3x-3)=9.
答案

(1)9x+17.2=57.7,

9x+17.2-17.2=57.7-17.2,

9x=40.5,

9x÷9=40.5÷9,

x=4.5;

(2)6.7x+2.2x=93.45,

8.9x=93.45,

8.9x÷8.9=93.45÷8.9,

x=10.5;

(3)X÷6.5=7.6

X÷6.5×6.5=7.6×6.5,

X=49.4;

(4)18(x+0.9)=22.5,

18(x+0.9)÷18=22.5÷18,

x+0.9=1.25,

x+0.9-0.9=1.25-0.9,

x=0.35;

(5)4×2.3+2x=9.8,

9.2+2x=9.8,

9.2+2x-9.2=9.8-9.2,

2x=0.6,

2x÷2=0.6÷2,

x=0.3;

(6)2(3x-3)÷2=9÷2,

3x-3=4.5,

3x-3+3=4.5+3,

3x=7.5,

3x÷3=7.5÷3,

x=2.5.

单项选择题
单项选择题