49*99+45的简便算法
问题描述:
49*99+45的简便算法
答
(45+4)*99+45
45*99+4*99+45
45*(99+1)+4*99
45*100+4*(100-1)
45*100+4*100-4
49*100-4
4900-4
4896
答
49×100-49+45
=4900-4
=4896
答
49*99+45
=49*(99+1)-4
=4900-4
=4896
答
49*99+45
=49*(100-1)+45
=4900-49+45
=4900-4
=4896