3.14×20= 2×= 1+= ()×9=
72÷= 1.5×100= 1.25×8= 99×0.8+0.8=
0.32-0.12= 12÷( )= 2.8× +3= 16.5÷10%=
1993-799≈ 1÷3× = 2.5×7×0.4= ×3÷ ×3=
3.9+2.7=
6-2.7=
1.9×4=
0.65÷0.1=
35÷0.1= 3.7+2.53= 700÷35= 75×20=
×15= ÷ = - = + =