爱上海后花园

计算下列各题,能简便的要简便计算.618÷45+1620 118÷(14+2.5×45) 67-67×(23+19) 2008÷200820082009. 200.8×73-6.3×2008 99-97+95-93+91-89+…+7-5+3-1.

1618451620=1311151620=163311152118142545=118142=11894=9849=12367672319=6712319=6729=42142008200820082009=20082008200920082009=2008200820102009=2008200920082010=200920105200873632008=200873632008=20087363=20081=200869997959391897531=9997959391897531=222222252=225=50...

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