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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

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

34+45=79 有异议欢迎追问~ 无异议记得采纳~

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

(1)34×99+34,=34×(99+1),=34×100,=3400;(2)4.83-2.56+15.17,=(4.83+15.17)-2.56,=20-2.56,=17.44;(3)(40+8)×25,=(40+8)×25,=40×25+25×8,=1000+200,=1200;(4)68×29+32×29,=(68+32)×29,=100×29,=2900;(5)17....

(1)(34+45)×20=34×20﹢45×20,=15﹢16,=31;(2)23+(47+12)×725=23+1514×725,=23+310,=2930;(3)813÷7+17×513=813×17+17×513,=17×(813+513),=17×1,=17.

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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