+= 3﹣= ×= ÷=
+= -= ÷51= ×5.6=
1800÷45= 6.4+9.6= 0.875﹣= 12×98≈
56×= 1.6×125%= ×24÷= 9+11+13+……+41=
16÷20%= 4.8÷(0.4+1.2)=
-(-)= 12÷0.25÷4=
4321+500= 13.2-5.2= × = 0.2×1.4=
8÷25%= + = 2.4÷ = ÷ =
50+950= 300﹣201= 45×8= 105÷3=
1﹣= ﹣= 15÷= ×=
12.12﹣12= 2.5×6= 100÷50%= 0.3×0.6=
÷3= 1+40%=
:8= 0.62= 0.8×0.25= 10-0.01= ( )×0.4=1