简便计算459×186-14?
3个回答
展开全部
=459(200-14)-14
=459×200-459×14-14
=459×200-14(459+1)
=459×200-14×460
=(460-1)200-14×460
=460×200-1×200-14×460
=92000-200-(10+4)460
=92000-200-10×460-4×460
=92000-200-4600-2×920
=91800-4600-2(900+20)
=91800-4600-2×900-2×20
=91800-4600-1800-40
=91800-6400-40
=91800-1800-4600-40
=90000-4600-40
=85400-40
=85360
=459×200-459×14-14
=459×200-14(459+1)
=459×200-14×460
=(460-1)200-14×460
=460×200-1×200-14×460
=92000-200-(10+4)460
=92000-200-10×460-4×460
=92000-200-4600-2×920
=91800-4600-2(900+20)
=91800-4600-2×900-2×20
=91800-4600-1800-40
=91800-6400-40
=91800-1800-4600-40
=90000-4600-40
=85400-40
=85360
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