【简答题】![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
神机妙算(能简算的要写出简算过程)
(1)4113×34+5114×45+6115×56+7116×67+8117×78+9118×89
(2)25×16%+114×21.75+114+2÷45+2.5÷322
(3)517-23×2514÷[(3112+4.375)÷]
(4)已知aba+b=5(a≠b),求a2-b2a2b-ab2的值.
(5)12+34+78+1516+3132+63+127128+255256.
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参考答案:
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参考解析:
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