乘法简便计算(一定要简便)
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/10 01:59:48
乘法简便计算(一定要简便)
1997×19961996-1996×19971997 54×888888-16×222222
(4×8×25-8)×125 37×402+7236÷18×64-67×6
808+8×22+8×2 345×354-344×355
75×2525-24×7575 快,正确最先的回答给追加分
1997×19961996-1996×19971997 54×888888-16×222222
(4×8×25-8)×125 37×402+7236÷18×64-67×6
808+8×22+8×2 345×354-344×355
75×2525-24×7575 快,正确最先的回答给追加分
1997×19961996-1996×19971997
=1997*1996*10001-1996*1997*10001
=0
54×888888-16×222222
=54*2*444444-8*444444
=108*444444-8*444444
=(108-8)*444444
=100*444444
=44444400
(4×8×25-8)×125
=8*(4*25-1)*125
=8*125*99
=1000*99
=99000
37×402+7236÷18×64-67×6
=37*402+402*64-402
=402*(37+64-1)
=402*100
=40200
808+8×22+8×2
=8*101+8*22+8*2
=8*(101+22+2)
=8*125
=1000
345×354-344×355
=(344+1)*354-344*(354+1)
=344*354+354-344*354-344
=354-344
=10
75×2525-24×7575
=25*3*2525-24*7575
=25*7575-24*7575
=7575*(25-24)
=7575*1
=7575
=1997*1996*10001-1996*1997*10001
=0
54×888888-16×222222
=54*2*444444-8*444444
=108*444444-8*444444
=(108-8)*444444
=100*444444
=44444400
(4×8×25-8)×125
=8*(4*25-1)*125
=8*125*99
=1000*99
=99000
37×402+7236÷18×64-67×6
=37*402+402*64-402
=402*(37+64-1)
=402*100
=40200
808+8×22+8×2
=8*101+8*22+8*2
=8*(101+22+2)
=8*125
=1000
345×354-344×355
=(344+1)*354-344*(354+1)
=344*354+354-344*354-344
=354-344
=10
75×2525-24×7575
=25*3*2525-24*7575
=25*7575-24*7575
=7575*(25-24)
=7575*1
=7575