3x-2=1.6 5x÷2=25 x-18=2.9+0.71 8x+x=2.97 14x-3x=1.21 1.6×25-5x=2
问题描述:
3x-2=1.6 | 5x÷2=25 | x-18=2.9+0.71 |
8x+x=2.97 | 14x-3x=1.21 | 1.6×25-5x=2 |
答
(1)3x-2=1.6,
3x-2+2=1.6+2,
3x=3.6,
3x÷3=3.6÷3,
x=1.2;
(2)5x÷2=25,
5x÷2×2=25×2,
5x=50,
5x÷5=50÷5,
x=10;
(3)x-18=2.9+0.71,
x-18+18=3.61+18,
x=21.61;
(4)8x+x=2.97,
9x=2.97,
9x÷9=2.97÷9,
x=0.33;
(5)14x-3x=1.21,
11x=1.21,
11x÷11=1.21÷11,
x=0.11;
(6)1.6×25-5x=2,
40-5x=2,
40-5x+5x=2+5x,
2+5x=40,
2+5x-2=40-2,
5x=38,
5x÷5=38÷5,
x=7.2.