+= += -= 1-=
-= += 0+= +=
17.2+2.8= 0.6×0.9= 8÷0.8= 8×1.25= 72.5×3.8×0=
123÷100= 0.74×100= 2.7÷3= 11.5-4.5= 1.4×2.5×4=
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=
0.3= 0.8= = =
0.26= =