解下列方程:1.18X-1.9X=19.38 2.16+5.2X=156.4 3.3(x+2)=8.7 4.12×5+4X=78.4 5.0.6/X=5这是试卷上的题呢~

1.结果是负数 2. 29.67 3. 1.63 4. 14.45 5. 咋两个小数点？？？？？

山东

1.18X-1.9X=19.38 2.16+5.2X=156.4 3.3(x+2)=8.7 4.12×5+4X=78.4 5.0.6/X=5
1.18X-1.9X=19.38 2.16+5.2X=156.4 3.3(x+2)=8.7 4.12×5+4X=78.4 5.0.6/X=5
1.18X-1.9X=19.38 2.16+5.2X=156.4 3.3(x+2)=8.7 4.12×5+4X=78.4 5.0.6/X=5
1.18X-1.9X=19.38 2.16+5.2X=156.4 3.3(x+2)=8.7 4.12×5+4X=78.4 5.0.6/X=5
1.18X-1.9X=19.38 2.16+5.2X=156.4 3.3(x+2)=8.7 4.12×5+4X=78.4 5.0.6/X=5

1.969/805
2.27
3.0.9
4.6.6
5.0.12

18X-1.9X=19.38
16.1x=19.38
x=19.38/16.1=1.2
2.
16+5.2X=156.4
5.2x=156.4-16=140.4
x=40.4/5.2=27
3
3(x+2)=8.7
x+2=8.7/3=2.9
x=2.9-2=0.9
4
12×5+4X=78.4
4x=78.4-60=18.4
x=18.4/4=4.6
5.
0.6/X=5
5x=0.6
x=0.6/5=0.12