+70%= 0.252= ×÷×= :=
30×40%= 10×10%= 40÷20%= 9÷10%=
20×30%= 60÷60%= 80÷40%= 70×50%=
80×20%= 200×9%= 3.6×50%= 100×25%=
3.14×5= 5²×3.14= 2²×3.14= 3.14×9=
1- 14 = 12 + 13 = 57 × 38 × 75 =
60×30%= 0÷ 521 = 56 + 25 - 56 - 25 =
1.92÷0.04= 8.3-2.53= 5.7×3.2-2.2×5.7=