1) 43×37= 1591
2)53²-63²=(53-63)(53+63)=-10×116=-1160
3) 472-372=100
4) 37²+12637+63²=17975
5)(50+2)²=50²+2×50×2+2²=2500+200+4=2704
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1) 43×37= 1591
2)53²-63²=(53-63)(53+63)=-10×116=-1160
3) 472-372=100
4) 37²+12637+63²=17975
5)(50+2)²=50²+2×50×2+2²=2500+200+4=2704