简便运算:84*49+84*76+125*16= 150*78+220*15=
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简便运算:84*49+84*76+125*16= 150*78+220*15=
简便运算:84*49+84*76+125*16= 150*78+220*15=
简便运算:84*49+84*76+125*16= 150*78+220*15=
84*49+84*76+125*16= 84*(49+76)+125*16=84*125+125*16
=(84+16)*125=100*125=12500
150*78+220*15=150*78+22*150=150*(78+22)=150*100=15000
=150*(78+22)=1.5*10^4