18÷1=1848+6=548+1=82+2=33+4=79+8=1719-6=1320+12=3217×40=680100-63=373.2+1.68=4.882.8×0.4= 1.1214-7.4=6.61.92÷0.04=480.32×500=1600.65+4.35= 5