1.123+234+345+456+567+678+7892.20082008*2007-2008*200720073.5000-1-2-3-4-.404.1500-2009+2008-2007+2006-.-5+4-3+2-15.1246000/250/89/86.(91*27*84*76)/(9*7*19*13)7.189*190190-190*189189
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 22:57:41
1.123+234+345+456+567+678+7892.20082008*2007-2008*200720073.5000-1-2-3-4-.404.1500-2009+2008-2007+2006-.-5+4-3+2-15.1246000/250/89/86.(91*27*84*76)/(9*7*19*13)7.189*190190-190*189189
1.123+234+345+456+567+678+789
2.20082008*2007-2008*20072007
3.5000-1-2-3-4-.40
4.1500-2009+2008-2007+2006-.-5+4-3+2-1
5.1246000/250/89/8
6.(91*27*84*76)/(9*7*19*13)
7.189*190190-190*189189
1.123+234+345+456+567+678+7892.20082008*2007-2008*200720073.5000-1-2-3-4-.404.1500-2009+2008-2007+2006-.-5+4-3+2-15.1246000/250/89/86.(91*27*84*76)/(9*7*19*13)7.189*190190-190*189189
1,123+234+345+456+567+678+789
=100+200+300+400+500+600+700+20+30+40+50+60+70+80+3+4+5+6+7+8+9
=2800+350+42
=3192
2,20082008×2007-2008 ×20072007
= 20082008×2007 -(2008-1 +1)×20072007
=20082008×2007-2007×20072007-20072007
=(20082008-20072007)×2007-20072007
=10001×2007-20072007
=20072007-20072007
=0
3,5000-1-2-3-4.40
=5000-(1+2+3+4.40)
=5000-(1+39+2+38+3+37+4+36.+40)
=5000-(40×20+20)
=5000-(800+20)
=5000-820
=4180
4,1500-2009+2008-2007+2006.-5+4-3+2-1
=1500-(2009-2008+2007-2006.+5-4+3-2+1)
=1500-(1+1.+1+1+1)
=1500-1×1005
=1500-1005
=495
5,1246000÷250÷89÷8
=1246000÷(250×8×89)
=1246000÷(2000×89)
=1246000÷178000
=1246÷178
=7
6,(91×27×84×76)÷(9×7×19×13)
=(13×7×3×9×84×19×4))÷(9×7×19×13)
=(3×4×84)÷1
=1008
7,189×190190-190×189189
=(189+1-1)×190190-190×189189
=190×190190-190×189189-190190
=190×(190190-189189)-190190
=190×1001-190190
=190190-190190
=0
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1.123+234+345+456+567+678+789
=456*7
=3192
2.20082008*2007-2008*20072007
=2008*10001*2007-2008*2007*10001
=0
3.5000-1-2-3-4-.............40
=5000-(1+2+3+4+....+40)
=500...
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1.123+234+345+456+567+678+789
=456*7
=3192
2.20082008*2007-2008*20072007
=2008*10001*2007-2008*2007*10001
=0
3.5000-1-2-3-4-.............40
=5000-(1+2+3+4+....+40)
=5000-(1+40)*40/2
=5000-820
=4180
4.1500-2009+2008-2007+2006-.................-5+4-3+2-1
=1500-2009+(2008-2007)+(2006-2005).................+(6-5)+(4-3)+(2-1)
=1500-2009+1+1+1+....+1
=1500-2009+1*1004
=2504-2009
=495
5.1246000/250/89/8
=1246000/(250*89*8)
=1246000/(250*8*89)
=1246000/(2000*89)
=623/89
=7*89/89
=7
6.(91*27*84*76)/(9*7*19*13)
=(13*7*27*84*76)/(9*7*19*13)
=(27*84*76)/(9*19)
=(3*9*84*76)/(9*19)
=(3*84*76)/19
=(3*84*19*4)/19
=3*84*4
=12*84
=1008
7.189*190190-190*189189
=189*190*1001-190*189*1001
=0
收起
1.123+234+345+456+567+678+789=28*100+35*10+42=3192
2.20082008*2007-2008*20072007=2008*2007(10001-10001)=0
3.5000-1-2-3-4-.............40=5000-40*(1+40)/2=4180
4.1500-2009+2008-2007+2006-.....
全部展开
1.123+234+345+456+567+678+789=28*100+35*10+42=3192
2.20082008*2007-2008*20072007=2008*2007(10001-10001)=0
3.5000-1-2-3-4-.............40=5000-40*(1+40)/2=4180
4.1500-2009+2008-2007+2006-.................-5+4-3+2-1=1500-1005=495
5.1246000/250/89/8=7
6.(91*27*84*76)/(9*7*19*13)=1008
7.189*190190-190*189189=189*190(1.001-1.001)=0
收起
1=(1+2+3+4+5+6+7)*100+(2+3+4+5+6+7+8)*10+(3+4+5+6+7+8+9)
=2800+350+42=3192
2=2008*10001*2007-2008*2007*10001=0
3=5000-(1+40)*40/2=5000-820=4180
4=1500+(2008+2)*2008/2/2-(2009+1)*(200...
全部展开
1=(1+2+3+4+5+6+7)*100+(2+3+4+5+6+7+8)*10+(3+4+5+6+7+8+9)
=2800+350+42=3192
2=2008*10001*2007-2008*2007*10001=0
3=5000-(1+40)*40/2=5000-820=4180
4=1500+(2008+2)*2008/2/2-(2009+1)*(2009+1)/2/2
=1500+2010*502-2010*502.5
=1500-2010*(502.5-502)=1500-2010*0.5=1500-1005=495
5=1246*4/8/89=623/89=7
6=91/13)*(76/19)*(27/9)*(84/7)=7*4*3*12=1008
7=189*190*1001-190*189*1001=0
收起
1、
=(4.8*6.3)/6.3*2.7+32.76/6.3*2.7
=(5*6.3-0.2*6.3)/6.3*2.7+32.76/6.3*2.7
=(31.5-1.26+32.76)/6.3*2.7
=(31.5+31.5)/6.3*2.7
=63/6.3*2.7
=27
2\
=88.8*2.6+44.4*2*3*2.5
全部展开
1、
=(4.8*6.3)/6.3*2.7+32.76/6.3*2.7
=(5*6.3-0.2*6.3)/6.3*2.7+32.76/6.3*2.7
=(31.5-1.26+32.76)/6.3*2.7
=(31.5+31.5)/6.3*2.7
=63/6.3*2.7
=27
2\
=88.8*2.6+44.4*2*3*2.5
=88.8*2.6+88.8*7.5
=88.8*(2.6+7.5)
=88.8*10.1
=88.8*10+88.8*0.1
=888+8.88
=896.88
3\
=24.8/(8*1.24*1.25)
=24.8/(8*1.25*1.24)
=24.8/(10*1.24)
=24.8/12.4
=2
收起