112+(3x+1)5=122
112+(3x+1)5= 144
(3x+1)5=144-112
(3x-1)5=32
suy ra ( 3x-1)5=25
3x-1=2
3x=2+1
3x=3
suy ra x=1
vậy x=1
112+(3x+1)5=122
112+(3x+1)5= 144
(3x+1)5=144-112
(3x-1)5=32
suy ra ( 3x-1)5=25
3x-1=2
3x=2+1
3x=3
suy ra x=1
vậy x=1
1) –45 + 5.(–2x) = 95
2) x.(12 + x).(71 – x) = 0
3) (x – 11).(x + 12).(–x – 13) = 0
4) |2.x – 15| = 7
5) –2.|x + 32| = –112
1) thực hiện phép tính
-126+67+[32-(-126)]-64
240-[(82-49):3+135]:18
A+1+2+22+23+...+22021
-205+37-(-200)
2) Tìm x∈z biết
x-45=48-68
35+5(6-x)=-12-(-112)
517-(x-124)=-483
46-(3x-2)3=(-38)+20
1) thực hiện phép tính
-126+67+[32-(-126)]-64
240-[(82-49):3+135]:18
A+1+2+22+23+...+22021
-205+37-(-200)
2) Tìm x∈z biết
x-45=48-68
35+5(6-x)=-12-(-112)
517-(x-124)=-483
46-(3x-2)3=(-38)+20
Tính hợp lí:
a. A= \(\left(\frac{112}{13.20}+\frac{112}{20.27}+\frac{112}{27.34}+.....+\frac{112}{62.69}\right)\): \(\left(-\frac{5}{9.13}-\frac{7}{9.25}-\frac{13}{19.25}-\frac{31}{19.69}\right)\)
b. B= \(\frac{2.2016}{1+\frac{1}{1+2}+\frac{1}{1+2+3}+\frac{1}{1+2+3+4}+......+\frac{1}{1+2+3+4+.....+2016}}\)
c. C= \(\frac{2^{12}.3^5-4^6.9^2}{\left(2^2.3\right)^6+8^4.3^5}-\frac{5^{10}.7^3-25^5.49^2}{\left(125.7\right)^3+5^9.14^3}\)
Giúp mk vs nha! Mai mk phải nộp rùi
tks m.n nhìu
giai ho toi nhe
(-3)-12.(+5)-(-5).(-7)mu 2
55-(-1350+64-(48+112)
(-2).12(+3)-(-7).(-5)mu 2
Thực hiện phép tính
(-12) + (-9) + 112 + |-30|
- 2015 + (-268) + (-201) + 168 + 301
160 : {|-17| + [3^2 x 5 - (14 + 2^11 : 2^8)]}
a) x + 15 = 89
b) 93 – x = 12.5
c) 2x – 12 = 57
d) 36 : (x + 1) = 4
e) 112 – 45 + 5x = 87
f) 6^2+ 64 : (x – 1) = 52
g) (55 – x).(2x – 44) = 0
h) x^2+ 4 = 13
i) 2.(x +1)^3=16
g)150 – 5(x – 2)^2 = 25
k) (x – 2).y = 3
l) (2 – x).(y – 4) = 8
Bài 1:Tính tổng :
1.D=1+3-5+7+.........+2011
2.E=2-4+6-8+..........+2006-2008+2010-2012
3.F=2-4-6+8+810-12-14+16+...................+98-200-102+104
4.H=1+2-3-4+5+6-7-8+9+10-11-12+....................-111-112+113+114
Tìm x thuộc N biết
a) 2*3x = 10*312+8*274
b) 2x+2 +2x+1+2x <112