Question

21×32+32×36+57×68+43×100怎么简便运算？

Answer 1

简便运算：21×32+32×36+57×68+43×100=32X (21+36)+57×68+43×100=57×32+57×68+43×100=57×(32+68)+43×100=57×100+43×100=(57+43)×100=100×100=10000

Answer 2

21×32+32×36+57×68+43×100
=(21+36)×32+57×68+43×100
=57×32+57×68+43×100
=57×(32+68)+43×100
=57×100+43×100
=(57+43)×100
=100×100
=10000

Answer 3

21X32+32X36+57X68+43X100
=32X（21+36）+57X68+43X100
=32X57+57X68+43X100
=57X（32+68）+43X100
=57X100+43X100
=（57+43）X100
=100X100
=10000

Answer 4

这种事故？这么！；一定程度很大气污染源排放总量