ai giúp minh đi cần quá gấp

a) \((-48).72 + 36.(-304)\)

\(=\left(-48\right).72+72.\left(-152\right)\)

\(=72.\left(\left(-48\right)-152\right)\)

\(=72.\left(-200\right)\)

\(=-14400\)

Nguyễn Huy TúNguyễn Huy ThắngHoàng ThịTrương Hồng Hạnh Ngọc AnhAkNguyễn Phương Trâmai Harumasoyeon_Tiểubàng giảiHoàng Lê Bảo NgọcHung nguyenHoàng Tuấn Đăng

X - 6 : 2 - (48 - 24) : 2 : 6 - 3 = 0

X - 3 - 24 : 2 : 6 -  3 = 0

X - 3 - 2 - 3 = 0

X = 0 + 3 + 2 + 3

X = 8

X - 6 : 2 - ( 48 - 24 ) : 2 : 6 - 3 = 0

X - 6 : 2 - 24 : 2  : 6 - 3 = 0

X - 3 - 12 : 6 - 3 = 0

X - 3 - 2 - 3 = 0

X = 0 + 3 + 2 + 3 

X = 8

1) 41 - 2^{x + 1} = 9

-2^{x + 1} = 9 - 41

-2^{x + 1} = -32

2^{x + 1} = 32

2^{x + 1} = 2⁵

x + 1 = 5

x = 5 - 1

x = 4

\(41-2^x+1=9\)

\(41-2^x=9-1=8\)

\(2^x=41-8=33\)

\(x=\sqrt{33}\)

Bài 2:

a) 11. x = -55

x = -55 : 11

x = -5

Vậy x = -5

b) -3 . x = -12

x = -12 : (-3)

x = 4

Vậy x = 4

c) 3x - 12 = -48

3x = -48 + 12

3x = -36

x = -36 : 3

x = -12

Vậy x = -12

d) 10 + 23 . (2x - 10) = -36

23 . (2x - 10) = -36 - 10

23 . (2x - 10) = -46

2x - 10 = -46 : 23

2x - 10 = -2

2x = -2 + 10

2x = 8

x = 8: 2

x = 4

Vậy x = 4

f) | 2x - 1| + 3 = 8

|2x - 1| = 8 - 3

|2x - 1| = 5

\(\Rightarrow\left[\begin{matrix}2x-1=5\\2x-1=-5\end{matrix}\right.\Rightarrow\left[\begin{matrix}2x=6\\2x=-4\end{matrix}\right.\Rightarrow\left[\begin{matrix}x=3\\x=-2\end{matrix}\right.\)

Vậy x = 3 hoặc x = -2

g) |2x² - 3| - 4 = 11

|2x²- 3| = 11 + 4

|2x² - 3| = 15

\(\Rightarrow\left[\begin{matrix}2x^2-3=15\\2x^2-3=-15\end{matrix}\right.\Rightarrow\left[\begin{matrix}2x^2=18\\2x^2=-12\end{matrix}\right.\Rightarrow\left[\begin{matrix}x^2=9\\x^2=-6\end{matrix}\right.\Rightarrow\left[\begin{matrix}x^2=3^2\\\left(loại\right)\end{matrix}\right.\Rightarrow\left[\begin{matrix}x=3\\\end{matrix}\right.\)

Vậy x = 3.

Bài 1:

\((-48) . 72 +36 . (-304) \)

\(=\left[\left(-48\right).\left(36.2\right)\right]+36.\left(-340\right)\)

\(=\left[\left(-48\right).2\right].36+36.\left(-340\right)\)

\(=\left(-96\right).36+36.\left(-304\right)\)

\(=36.\left[\left(-96\right)+\left(-304\right)\right]\)

\(=36.\left(-400\right)\)

\(=-14400\)

\(a;-\frac{3}{9}+\frac{7}{15}=-x+\left(-\frac{5}{18}\right)\)

\(\Rightarrow\frac{2}{15}=-x-\frac{5}{18}\)

\(\Rightarrow-x=\frac{2}{15}+\frac{5}{18}=\frac{37}{90}\)

\(b;2x-\frac{3}{4}=x-\frac{1}{2}\)

\(\Rightarrow2x-x=-\frac{1}{2}+\frac{3}{4}\)

\(\Rightarrow x=\frac{1}{4}\)

a)-3/9+7/15=-x+(-5/18)                     b)2x-3/4= x-1/2

 =>-x+(-7/15)=2/15                          =>2x-x=3/4-1/2

 =>-x=2/15-(-7/15)                           =>x=1/4

 =>-x=3/5

 =>x=+3/5

4x² = 100

=> x² = 100 : 4 

=> x² = 25

=> x² = 5²

=> x = 5

Trả lời:

\(\text{a) 48-(2x+9)=21+x }\)

\(48-2x-9=21+x\)

\(-2x-x=21+9-48\)

\(-3x=-18\)

\(x=6\)

Vậy x = 6

b)\(\left(x+4\right)\left(11-x\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x+4=0\\11-x=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-4\\x=11\end{cases}}\)

Vậy x = -4; x = 11

c)\(4x^2=100\)

\(x^2=25\)

\(x^2=5^2\)

\(\Rightarrow x=5\)

Vậy x = 5

~ Học tốt

#Huyền Anh =P