1990×19911991-1991×19901990

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• 英语选择题13题1.it is often less expensive to buy goods _____a.in huge quantities b.a lot c.in quality d.ad most2.he rushed off,even _____ to take his overcoat.a.forgets b.forgetting c.forgotten d.having forgotten3.the Hubble telescope _____ into space in 1990 was faulty from the start.a.launching b.launched c.to launch d.having launched4.the forest fire _____ put out earlier.But in fact it took the firemen three months to put it out.a.needn't have been b.o
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• 简便运算1990/1990*1991+1990/1991*1992+.+1990/2001*2002=
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• 有20堆石子，每堆都有2006粒，规定：从任意19堆中各取一粒放入另一堆称为一次操作．经过不足20次这种操作后，某一堆有石子1990粒，另一堆的石子数在2080到2100之间，这一堆石子有多少粒？
• 1991的平方-1990的平方=?简便运算
• -I have already been to the Great Wall three times.-When ___ you __ there?-In 1990,1996 and2003A.have;been B.did;go C.will;go D.have;gone
• 在以下两个数串中：一：1,3,5,7,9,11,13,15……,1991,1993,1995,1997,1999二：1,4,7,10,13,16,19……,1990,1993,1996,1999同时出现在这两个数串中的数有几个?
• 他喜欢留20世纪90年代的发型.英文翻译.He likes to wear his hair---- a 1990s ----.
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• 1、已知(a的平方+b的平方）乘以（a的平方+b的平方-8）+16=0,求a的平方+b的平方的值.（答案为4,