如题所述
678+591+409=678+1000=1678
125*64*25=125*4*4*4*25=500*4*100=200000
25*25*16=25*4*25*4=10000
72*125=8*9*125=9*1000=9000
125*64*25=125*4*4*4*25=500*4*100=200000
25*25*16=25*4*25*4=10000
72*125=8*9*125=9*1000=9000
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第1个回答 2020-03-11
简便计算
678+591+409
=678+(591+409)
=678+1000
=1678
125x64x25
=(125ⅹ8)x(8x25)
=1000x200
=200000
25x25x16
=(25x4)x(25x4)
=100x100
=10000
72x125
=9x(8x125)
=9x1000
=9000
678+591+409
=678+(591+409)
=678+1000
=1678
125x64x25
=(125ⅹ8)x(8x25)
=1000x200
=200000
25x25x16
=(25x4)x(25x4)
=100x100
=10000
72x125
=9x(8x125)
=9x1000
=9000