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15×34+45×22的简便运算

=15×34+15×3×22 =15×34+15×66 =15×(34+66) =15×100 =1500

34/45×44 =34/45×(45-1) =34/45×45-34/45×1 =34-34/45 =33又11/45

(12+23+34)×(23+34+45)-(12+23+34+45)×(23+34) =(12+23+34)×(23+34+45)-(23+34+45)×(23+34)-12×(23+34) =(23+34+45)×12-12×(23+34) =12×45 =540

用简便方法计算:41 13×34+51 14×45+64 15×56 41 13×34+51 14×45+64 15×56 =41+442+51+630+64+840 =2068 直接计算 没有溅洒追

34.5+3.45x10x9.9 =34.5+34.5x9.9 =34.5x10.9 =376.05 感觉还是好复杂

33×45-34×33+89×33=33×(45-34+89)=33×100=3300

45x34+34x54+34 =34*(45+54+1) =34*100 =3400

34×56减34+45乘34 =34×(56-1+45) =34×100 =3400

4.5×8.23-3.45+2.77×34.5 =4.5×8.23+2.77×34.5-34.5×0.1 =4.5×8.23+34.5×2.67 =4.5×8.23+(30+4.5)×2.67 =4.5×8.23+4.5×2.67+30×2.67 =4.5×10.9+30×2,67 =49.5+80.1 不知道这种方法算不算简便,仅供参考。 =129.15

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