66.8+21.9=
90%-0.8=
30÷80%=
5.5÷0.5=
0.2×0.4=
×=
16÷=
20-0.2=
3×9÷3×9=
-=
+50%=
5×(+)=
46.7+2.3-20=
24×0.5= 7.2÷0.08= 36×75%= 4÷9=
÷ = - = + × = + - + =
① 12.5×32×2.5 ②
③ ④
420 - 190= 17.88+0.2= 2.5×0.4= 1÷0.2=
= =
2.05×4= 0.14÷0.2 = 0.5²=
0.15×0.8= 4.12÷4= 2.7+3= +×=
2.4÷= ×= 5-= 6.4×0.5÷6.4×0.5=