问题
解答题
简便计算.
35×7×2
9×250×4
201×45
236+199.
答案
(1)35×7×2
=35×2×7
=70×7
=490
(2)9×250×4
=9×(250×4)
=9×1000
=9000
(3)201×45
=(200+1)×45
=200×45+1×45
=9000+45
=9045
(4)236+199
=236+200-1
=435
简便计算.
35×7×2
9×250×4
201×45
236+199.
(1)35×7×2
=35×2×7
=70×7
=490
(2)9×250×4
=9×(250×4)
=9×1000
=9000
(3)201×45
=(200+1)×45
=200×45+1×45
=9000+45
=9045
(4)236+199
=236+200-1
=435