简便运算 69×276+131+24?
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69*276+131+24
=(100-31)*(100-24+200)+31+24+100
=(100-31)*200+(100-31)*(100-24)+31+24+100
=(100-31)*200+100*100-(31+24)*100+31*24+31+24+100
=(100-31)*200+100*100-55*100+31*24+31+24+100
=200*100-31*200+100*100-55*100+31*25+24+100
=300*100-31*200-55*100+3100/4+24+100
=30000-6200-5500+775+24+100
=30000-11700+100+775+24
=30000-11600+775+24
=18400+799
=18400+800-1
=19200-1
=19199
=(100-31)*(100-24+200)+31+24+100
=(100-31)*200+(100-31)*(100-24)+31+24+100
=(100-31)*200+100*100-(31+24)*100+31*24+31+24+100
=(100-31)*200+100*100-55*100+31*24+31+24+100
=200*100-31*200+100*100-55*100+31*25+24+100
=300*100-31*200-55*100+3100/4+24+100
=30000-6200-5500+775+24+100
=30000-11700+100+775+24
=30000-11600+775+24
=18400+799
=18400+800-1
=19200-1
=19199
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