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+= += -= 1-=
-= += 0+= +=
7÷12= 4÷6= 21÷49= 12.5×4=
5.5×200= 25÷0.05= 1.6÷3.2= 48×0.02=
+ = - = - = 7- =
0.6×2.5= 7×0.03= 12.5÷2.5= 2.8×0.3=
4.5÷0.01= 1.8×50= 10-0.13= 0.125×0.25×32=