几道数学题~

1.20(7-5)X5 = 50

2.10(6-5)X6 = 60 900÷60 = 15

3.6:60% = X∶40% = 10 12-10 = 2

4.32÷(9-5)×9=72 32÷(9-5)×5=40

5.44÷(5-4)×5=220 220×60=13200

6.很抱歉我没去成