问题 解答题
解方程
2(x+1.7)=9.21.2x÷2=602x-0.6×4=0.12
16×0.5+3x=147x+2.5x=3.8(3.8-2)x=14.4.
答案

(1)2(x+1.7)=9.2,

2(x+1.7)÷2=9.2÷2,

x+1.7-1.7=4.6-1.7,

x=2.9;

(2)1.2x÷2=60,

1.2x÷2×2=60×2,

1.2x=120,

1.2x÷1.2=120÷1.2,

x=100;

(3)2x-0.6×4=0.12,

2x-2.4+2.4=0.12+2.4,

2x=2.52,

2x÷2=2.52÷2,

x=1.26;

(4)16×0.5+3x=14,

8+3x-8=14-8,

3x=6,

3x÷3=6÷3,

x=2;

(5)7x+2.5x=3.8,

9.5x=3.8,

9.5x÷9.5=3.8÷9.5,

x=0.4;

(6)(3.8-2)x=14.4,

1.8x=14.4,

1.8x÷1.8=14.4÷1.8,

x=8.

单项选择题
填空题