\(100\cdot90\cdot60\cdot77\cdot100=100^2\cdot90\cdot60\cdot77\)

\(=4158000000\)(4 tỉ 158 triệu)

x + 60 = 100 + 100

x + 60 = 200

       x = 200 - 60

       x = 140

k cho mik nha

x + 60 = 100 + 100

x + 60 = 200

x        = 200 - 60

x        = 140

= 140 nhé bạn

\(\dfrac{100}{x}-\dfrac{100}{x+10}=\dfrac{30}{60}=0,5\left(ĐKXĐ:x\ne0;x\ne-10\right)\\ \Leftrightarrow\dfrac{100\left(x+10\right)-100x}{x\left(x+10\right)}=\dfrac{0,5x\left(x+10\right)}{x\left(x+10\right)}\\ \Leftrightarrow100x-100x+1000=0,5x^2+5x\\ \Leftrightarrow0,5x^2+5x-1000=0\\ \Leftrightarrow0,5x^2-20x+25x-1000=0\\ \Leftrightarrow0,5x.\left(x-40\right)+25.\left(x-40\right)=0\\ \Leftrightarrow\left(0,5x+25\right)\left(x-40\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}0,5x+25=0\\x-40=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-50\\x=40\end{matrix}\right.\\ Vậy:S=\left\{-50;40\right\}\)

a) x + 100 = 50 + 60

x + 100 = 110

x = 110 - 100

x = 10

b) x + 50 = 30 + 60

x + 50 = 90

x = 90 - 50

x = 40

_______________________________________________THE END_____________________________________________________

a)=10

b)40 

tk m nhé

A)

x+100=50+60

x+100=110

x=110-100

x=10

B)

x+50=30+60

x+50=90

x=90-50

x=40

a. = 267 + 864 - 263 - 860

= (267 - 263) + (864 - 860)

= 4 + 4

= 8

b. = [(257 + 37) x 35] : 60

= [294 x 35] : 60

= 10290 : 60

= 171,5

c. = [(139 - 39) x 257] : 100

= [100 x 257] : 100

= 25700 : 100

= 257

b: \(\Leftrightarrow\dfrac{20}{x}-\dfrac{20}{x+20}=\dfrac{1}{6}\)

=>\(\dfrac{20x+400-20x}{x\left(x+20\right)}=\dfrac{1}{6}\)

=>x*(x+20)=400*6=2400

=>x^2+20x-2400=0

=>(x+60)(x-40)=0

=>x=-60 hoặc x=40

c: \(\dfrac{2x+1}{2x-1}-\dfrac{2x-1}{2x+1}=\dfrac{8}{4x^2-1}\)

=>(2x+1)^2-(2x-1)^2=8

=>4x^2+4x+1-4x^2+4x-1=8

=>8x=8

=>x=1(nhận)

<=>\(x+x-\frac{25x}{100}-\frac{25}{100}=60\)

<=>\(2x-\frac{50x}{100}=60\)

<=>\(\frac{150x}{100}=60\)

<=> 150x=6000

<=> x=40

=>x^2+60x=100*(-7/5)=-140

=>x^2+60x+140=0

=>\(x=-30\pm2\sqrt{190}\)