28×21×52运用简便方法怎么计算?

2024-12-18 20:16:11
推荐回答(4个)
回答1:

28×21×52运用简便方法怎么计算?
解:28×21×52
=4x7x21x(50+2)
=4x7x21x50+4x7x21x2
=4x50x7x21+4x2x7x21
=(200+8)x7x21
=208x7x21
=1456x21
=1456x(20+1)
=29120+1456
=30576

回答2:

28×21×52
=(20+8)×(50+2)×(20+1)
=(1000+440+16)×(20+1)
=1456×(20+1)
=29120++1456
=30576

回答3:

28*21*52
=4*7*3*7*13*4
=4*4*49*39
=4*4*(50-1)*(40-1)
=(200-4)*(160-4)
=32000-800-640+16
=30560+16
=30576
请参考

回答4:

28*21*52
=4*7*21*52
=(21*7)*(52*4)
=147*208
=30576