解方程或比例.(1)10-5x=2(2)512:0.8=x:0.48.

解方程或比例.(1)10-5x=2(2)512:0.8=x:0.48.
2024-12-03 17:57:22
推荐回答(2个)
回答1:

(1)10-5x=2,
      10-5x+5x=2+5x,
            10=2+5x,
          10-2=2+5x-2,
             8=5x,
          8÷5=5x÷5,
             x=1.6;

(2)

5
12
:0.8=x:0.48,
           0.8x=0.48×
5
12

      0.8x÷0.8=0.2÷0.8,
              x=0.25.

回答2:

(1)10-5x=2,
10-5x+5x=2+5x,
10=2+5x,
10-2=2+5x-2,
8=5x,
8÷5=5x÷5,
x=1.6;
(2)
5
12
:0.8=x:0.48

0.8x=0.48×
5
12

0.8x÷0.8=0.2÷0.8,
x=0.25.