解方程,一.7x-4.8=0.8二.8.4x-6x=7.2三.5x+3*0.7=4.6

分类: 作业答案 • 2021-12-19 16:55:27

问题描述：

答

1.x=0.8
2.x=3
3.x=0.5

答

7x-4.8=0.8
7X=5.6
X=0.8
8.4x-6x=7.2
2.4X=7.2
X=3
5x+3*0.7=4.6
5X＋2.1=4.6
5X=2.5
X=0.5

答

7x-4.8=0.8 8.4x-6x=7.2 5x+3*0.7=4.6
7x=0.8+4.8 2.4x=7.2 5x=4.6-3*0.7
7x=5.6 x=7.2/2.4 5x=2.5
x=5.6/7 x=3 x=2.5/5
x=0.8 x=0.5

答

7x-4.8=0.8,则7x=5.6,x=0.8
8.4x-6x=7.2,则2.4x=7.2,x=3
5x+3*0.7=4.6,则5x=4.6-2.1=2.5,x=0.5