问题
解答题
求未知数x.
|
答案
①6×3-1.8x=7.2,
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
7.2+1.8x=18,
7.2+1.8x-7.2=18-7.2,
1.8x=10.8,
1.8x÷1.8=10.8÷18,
x=0.6;
②
=x 0.7
,4 3.5
3.5x=2.8,
3.5x÷3.5=2.8÷3.5,
x=0.8.
求未知数x.
|
①6×3-1.8x=7.2,
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
7.2+1.8x=18,
7.2+1.8x-7.2=18-7.2,
1.8x=10.8,
1.8x÷1.8=10.8÷18,
x=0.6;
②
=x 0.7
,4 3.5
3.5x=2.8,
3.5x÷3.5=2.8÷3.5,
x=0.8.