\(35\cdot34+70\cdot38+65\cdot75+65\cdot35\)

\(=35\cdot34+35\cdot76+65\cdot\left(75+35\right)\)

\(=35\cdot\left(34+76\right)+65\cdot110\)

\(=35\cdot110+65\cdot110\)

\(=110\cdot\left(65+35\right)\)

\(=110\cdot100=11000\)

35 . 34 + 70 . 38 + 65 . 75 + 65 . 35

= 35 . 34 + 35 . 76 + 65 . 75 + 65 . 35

= 35 . (34 + 76) + 65 . (75 + 35)

= 35 . 110 + 65 . 110

= 110 . (35 + 65)

= 110 . 100

= 11000

~Std well~

\(35\cdot34+70\cdot38+65\cdot75+65\cdot35\)

\(=35\cdot34+35\cdot76+65\cdot75+65\cdot35\)

\(=35\cdot\left(34+76\right)+65\cdot\left(75+35\right)\)

\(=35\cdot110+65\cdot110\)

\(=110\cdot\left(35+65\right)\)

\(=110\cdot100=11000\)

a: =-100-100=-200

b: =-20+20=0

a,(-15)-23+(-85)-77=[(-15)+(-85)]-(23+77)=(-100)-100=-200
b,(-24) + 4 + (-6) + 26 =[(-24)+(-6)]+(4+26)=(-30)+30=0
c, 34 + 35 + 36 + 37 - 14 - 15 - 16 - 17 =(34-14)+(35-15)+(36-16)+(37-17)=20+20+20+20=80

a) =100

b) = 0

c) =80

Ta có : 

\(\frac{x-1}{27}+\frac{x-2}{26}+\frac{x-3}{25}+\frac{x-4}{24}=4\)

\(\Leftrightarrow\)\(\left(\frac{x-1}{27}-1\right)+\left(\frac{x-2}{26}-1\right)+\left(\frac{x-3}{25}-1\right)+\left(\frac{x-4}{24}-1\right)=4-4\) ( trừ 2 vế cho 4 ) 

\(\Leftrightarrow\)\(\frac{x-28}{27}+\frac{x-28}{26}+\frac{x-28}{25}+\frac{x-28}{24}=0\)

\(\Leftrightarrow\)\(\left(x-28\right)\left(\frac{1}{27}+\frac{1}{26}+\frac{1}{25}+\frac{1}{24}\right)=0\)

Vì \(\frac{1}{27}+\frac{1}{26}+\frac{1}{25}+\frac{1}{24}\ne0\)

Nên \(x-28=0\)

\(\Rightarrow\)\(x=28\)

Vậy \(x=28\)

Chúc bạn học tốt ~ 

\(x-\frac{1}{27}+x-\frac{2}{26}+x-\frac{3}{25}+x-\frac{4}{24}=4\)

\(\left(x+x+x+x\right)-\left(\frac{1}{27}+\frac{2}{26}+\frac{3}{25}+\frac{4}{24}\right)=4\)

\(4x-\frac{7031}{17550}=4\)

\(4x=4+\frac{7031}{17550}\)

\(x=\frac{4+\frac{7031}{17550}}{4}=1+\frac{\frac{7031}{17550}}{4}\)

\(x=1+\frac{7031}{70200}\)

.........................................................................................

CÁI ĐỀ CỦA BẠN DỄ GÂY HIỂU NHẦM QUÁ !!!

72^3*54^2=1088391168

108^4=136048896

bạn chấm điểm cho mik với nhé ;)))

câu b 

3^10.11+3^10x5  = 3^10.16  = 3.3.3^8.2.8   =3^8.2

   39.24                      39.24       3.13.3.8         13

mik ghi xuống dòng như vậy là giống phân số á bn, lm đúng ko thì ko chắc :)))

có z sai nhờ mn sửa giúp :>>>>

1) (-37) + 14 + 26 + 37

= [(-37) + 37] + 14 + 26

= 0 + 40

= 40

2) (-24) + 6 + 10 + 24

= [(-24) + 24] + 6 + 10

= 0 + 16

= 16

3) 15 + 23 + (-25) + (-23)

= 15 + (-25) + [(-23) + 23]

= -10 + 0

= -10

4) 60 + 33 + (-50) + (-33)

= 60 + (-50) + [(-33) + 33]

= 10 + 0

= 10

f(1)=3

f(-1)=3

\(\text{f(1)=}2.1^2+1=3\)

\(\text{f(-1)=}2.\left(-1\right)^2+1=3\)

\(\text{f(2)=}2.2^2+1=9\)

\(\text{f(0)=}2.0^2+1=1\)

\(\text{f(-3)=}=2.\left(-3\right)^2+1=19\)