简便运算51×99+51 145+263+55-63 27×9...
简便运算51×99+51145+263+55-6327×99643-10217×23-23×7350÷14....
简便运算51×99+51 145+263+55-63 27×99 643-102 17×23-23×7 350÷14.
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①51×99+51
=51×(99+1)
=51×100
=5100;
②145+263+55-63
=(145+55)+(263-63)
=200+200
=400;
③27×99
=27×(100-1)
=27×100-27
=2700-27
=2673;
④643-102
=643-(100+2)
=643-100-2
=541;
⑤17×23-23×7
=23×(17-7)
=23×10
=230;
⑥350÷14
=350÷(7×2)
=350÷7÷2
=50÷2
=25.
=51×(99+1)
=51×100
=5100;
②145+263+55-63
=(145+55)+(263-63)
=200+200
=400;
③27×99
=27×(100-1)
=27×100-27
=2700-27
=2673;
④643-102
=643-(100+2)
=643-100-2
=541;
⑤17×23-23×7
=23×(17-7)
=23×10
=230;
⑥350÷14
=350÷(7×2)
=350÷7÷2
=50÷2
=25.
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