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b) 52x-3 - 2.52 = 52 .3
52x-3 - 2.25 = 25 .3
52x-3 - 50 = 75
52x-3 = 75 + 50
52x-3 = 125
52x-3 = 53
2x-3 = 3
2x = 3 + 3
2x = 6
x = 6 : 2
x = 3
Vậy x = 3
x+(x+1)+(x+2)+...+(x+30)=1240
x+x+1+x+2+...+x+30=1240
(x+x+x+...+x)+(1+2+...+30)=1240
31x+465=1240
31x=1240-456
31x=784
x=784:31
x=784/31
Vậy x=784/31
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rút 1.2.3...2015 ra ta có
1.2.3...2015(2016-1-2015)
1.2.3...2015.0
=0
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1.2.3....9-1.2.3....8-1.2.3...8.8= 1.2.3....9-(12.3....8+1.2.3...8.8)=1.2.3...9-(1.2.3....8(1+8)=1.2.3....9-1.2.3....9=0
đang ký trang youtube này dùm nha https://www.youtube.com/channel/UCdMJRiuo_35tKETQtnAYOBQ
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Mình đoán bạn thi học sinh giỏi. Bạn yên tâm đi, lớp 6 chưa hoc ! ( than cảm) đâu nên cô sẽ ko mắng. Mình cũng thi, cô bảo ko phải làm đó
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cau b ta co9;(x+x+.....+x)-(1+2+....+100)=4950
100x - 5050 =4950
100x =4950+5050
100x =10000
x=10000 ;100
x=100
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1.2.3...9 - 1.2.3...8 - 1.2.3...82
= 1.2.3...8.(9 - 1) - 1.2.3...82
= 1.2.3...8.8 - 1.2.3...8.8
= 0
1.2.3...9 - 1.2.3...8 - 1.2.3...82
= 1.2.3...8.(9 - 1) - 1.2.3...82
= 1.2.3...8.8 - 1.2.3...8.8
= 0
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