解方程或解比例 6×3-1.8x=7.2 10:x=

解方程或解比例 6×3-1.8x=7.2 10:x=4.5:0.8 14:18=x:110.
2025-06-22 13:50:02
推荐回答(1个)
回答1:

(1)6×3-1.8x=7.2,
           18-1.8x=7.2,
      18-1.8x+1.8x=7.2+1.8x,
                18=7.2+1.8x,
            18-7.2=7.2+1.8x-7.2,
              10.8=1.8x,
         10.8÷1.8=1.8x÷1.8,
                 x=6;

(2)10:x=4.5:0.8,
      4.5x=10×0.8,
      4.5x=8,
 4.5x÷4.5=8÷4.5,
         x=

16
9


(3)
1
4
1
8
=x:
1
10

       
1
8
x=
1
4
×
1
10

       
1
8
x=
1
40

   
1
8
1
8
=
1
40
÷
1
8

          x=
1
5