Question

64×167-64×142 1999＋999×999 32×（25×125） 314×46＋314×55 简便计算

Answer 1

64×167-64×142
=64x(167-142)
=64x25
=16x(4x25)
=1600

1999＋999×999
=1000+999+999x999
=1000+999x(1+999)
=1000+999x1000
=1000x(1+999)
=1000000

32×（25×125）
=4x8x25x125
=(4x25)x(8x125)
=100x1000
=100000

314×46＋314×55
=314x(46+55)
=314x101
=314x(100+1)
=314x100+314x1
=31400+314
=31714

Answer 2

64×167-64×142
=64*(167-142)
=64*25
=16*100
=1600
1999＋999×999
=999*2+1+999*999
=999*(999+2)+1
=999*1001+1
=999000+999+1
=1000 000
32×（25×125）
=4*25*8*125
=100*1000
=100 000
314×46＋314×55

=314*100
=31400 .