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a)1+2+3+...+99+100=(100+1).100:2=5050
b)22+24+26+...+100+112=(22+112).46:2=3082
a) SSH: (100-1):1+1=100
Tổng: (100+1)x100:2=5050
b) SSH: (112-22):2+1=46
Tổng: (112+22)x46:2=3082
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mk ko ghi lại đề bài nha
a, = [(-37) +37] + (14+26)
= 0+40
= 40
b, = [( -24) +24] +(6+10)
= 0+ 16
= 16
k mk nha bạn
a , ( - 37 ) + 14 + 26 + 37
= [ ( - 37 ) + 37 ] + 14 + 16
= 0 + 14 + 16
= 30
b , ( - 24 ) + 6 + 10 + 24
= [ ( - 24 ) + 24 ] + 6 + 10
= 0 + 6 + 10
= 16
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B = 1 2 + 1 6 + 1 12 + 1 20 + 1 30 + 1 42 + 1 56 + 1 72 + 1 90
B = 1 1.2 + 1 2.3 + 1 3.4 + 1 4.5 + 1 5.6 + 1 6.7 + 1 7.8 + 1 8.9 + 1 9.10
= 1 − 1 2 + 1 2 − 1 3 + 1 3 − 1 4 + 1 4 − 1 5 + ... + 1 9 − 1 10
= 1 + − 1 2 + 1 2 + − 1 3 + 1 3 + − 1 4 + 1 4 + − 1 5 + 1 5 + ... + − 1 9 + 1 9 − 1 10
= 1 − 1 10 = 9 10
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c) Ta co : A=1/2^1+1/2^2+...+1/2^49+1/2^50
2A=1+1/2+1/2^2+........+1/2^48+1/2^49
A=1-1/2^50<1
Vậy A=1/2^1+1/2^2+...+1/2^49+1/2^50 <1