Nguyễn Thăng Long
Giới thiệu về bản thân
đang lớp 7...
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2022-11-05 20:12:12
60-[42-(2021-2020)^1999]
=60-[42-1^1999]
=60-41
=19.
2022-11-05 20:10:27
S=1+2+2^2+...+2^2022
2S=2+2^2+2^3+...+2^023
2S+S=(1+2+2^2+...+2^2022)+(2+2^2+2^3+...+2^2023)
3S=1+2^2023
S=1+2^2023
________ .
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2022-11-03 20:58:54
(2x-6)^3=8
(2x-6)^3=2^3
2x-6=2
2x=8
x=4.
Vâỵ x= 4.
2022-11-03 20:56:24
2022-10-22 19:34:34
x^2-10x=-25
x.x-10x=-25
x.(x-10)=-25
=>x=-25 hoặc x-10=-25
x =-35
Vậy x thuộc {-25;-35}
2022-10-13 20:43:56
3/4+2/3+5/12
=9/12+8/12+5/12
=11/6.
2022-10-13 20:42:10
2022-10-12 20:42:21
2022-10-11 20:37:48
(x-31)+27=94
x-31 =94-27
x-31 =67
x =67+31
x=98. Vậy x= 98.
2022-10-11 20:24:48
70=2.5.7
110=2.5.11
770=2.5.7.11
=> các ước ngtố là {2;5;7;11}