7×= ×= ×= 2×1= =
×21= 51×= ×25= = ×3=
= = ×0= =
×12= = 45×= ×=
0×= ×7= 10×= 39×=
24×= ×= ×= 1.8×=
3.14×9= 7.2×= 1.25××0.8=
3.14×2.25= 12×()=
10-3.8= 2.8+8.2= 1.2÷0.4= 0.88×10= 1.25×11×8=
+ = × = 53= ÷4= 120×( - )=
12.5×0.8= 5-1 = 0.98×99+0.98= 7÷ ×7× =
÷ = × = 0.72÷0.6= 1.4× - ×1.4=
127+38= 8.8÷0.2= 2-1 = ×1 =
1÷7+ = 1-1× = + = 1.02-0.43=
÷25%× = ×2÷ ×2=