Вычислите рациональным способом:
425 · 88 +139 · 25+425 · 12+139 · 75 ;
680 · 17 + 300 ·34+680·33+300 · 16
425 · 88 +139 · 25+425 · 12+139 · 75 ;
680 · 17 + 300 ·34+680·33+300 · 16
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=100(425+139)=100*564=56400
2) 680*17+300*34+680*33+300*16=680(17+33)+300(34+16)=680*50+300*50=
=50*(680+300)=50*980=49000