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15×34+45×22的简便运算

134x(56+45)+34 =134x101+34 =134x100+134+34 =13568 帮助采纳一下

(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

45×67+45×34-45简便计算 45×67+45×34-45 =45x(67+34-1) =45x100 =4500

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

45×34×34+54×34 =(45×34+54)×34 =(9X5×34+9X6)×34 =(5X34+6)X9X34 =176X34X9 =(100+76)(100-76+10)X9 =(100^2-76^2)X9+176X90 =90000-(75+1)^2 X 9 + 17600 - 1760 =107600-1760-(5625+150+1)X9 =107600-1760-57760+5776 =53856

应该是拆括号+变-

425×34+65×425+45 =425×34+425×65+425-380 =425×(34+65+1)-380 =425×100-380 =42500-380 =42120

34.55×0.6+ 65.45×1.6 =0.6×(34.55+65.45)+65.45×1 =0.6×100+65.45 =60+65.45 =125.45

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11+12+13+14+15+21+22+23+24+25+31+32+33+34+35+41+42+43+44+45=(11+45)×[(45-11)÷1+1]÷2,=56×[34+1]÷2,=56×35÷2,=980.故答案为:980

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