问题
解答题
解比例. 15:x=0.2:44
48-(1.08+0.12)x=45.6. |
答案
(1)15:x=0.2:44
0.2x=15×44
0.2x=660
0.2x÷0.2=660÷0.2
x=3300;
(2)
:18%=3 20 6.5 x
x=18%×6.53 20
x=1.173 20
x÷3 20
=1.17÷3 20 3 20
x=7.8;
(3)48-(1.08+0.12)x=45.6
48-1.2x=45.6
48-1.2x+1.2x=45.6+1.2x
1.2x+45.6=48
1.2x+45.6-45.6=48-45.6
1.2x=2.4
1.2x÷1.2=2.4÷1.2
x=2.