1- = + = × × =
60×30%= 0÷ = + - - =
1.92÷0.04= 8.3-2.53= 5.7×3.2-2.2×5.7=
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=
= = (4.5-4.5)×15= ( )÷ =
15.5× = ÷20%= 0.125×5×0.8= ×8÷ ×8=