xy + 2x + y + 2 = y(x + 1) + 2(x + 1) = (x + 1).(y + 2)

x(x - 1) + x(x + 3) = x(x - 1 + x + 3) = x. ( 2x + 2) = 2x.(x + 1)

\(-4x^2+8x-4=-4\left(x^2-2x+1\right)=-4\left(x-1\right)^2\)

c: \(-4x^2+8x-4\)

\(=-4\left(x^2-2x+1\right)\)

\(=-4\left(x-1\right)^2\)

a) \(xy+2x+y+2\)

\(=\left(xy+y\right)+\left(2x+2\right)\)

\(=y\left(x+1\right)+2\left(x+1\right)\)

\(=\left(y+2\right)\left(x+1\right)\)

b) \(x\left(x-1\right)+x\left(x+3\right)\)

\(=x^2-x+x^2+3x\)

\(=2x^2+2x\)

\(=2x\left(x+1\right)\)

c) \(-4x^2+8x-4\)

\(=-\left[\left(2x\right)^2-2.2x.2+2^2\right]\)

\(=-\left(2x-2\right)^2\)

c

có  tính 6a ko

kick    tui  đi

mk học lp 6B nhưng là trường THCS Trung Hòa

minh hoc o Vinh thanh , Yen Thanh ,Nghe An

x - 425 = 43935:87

x - 425 = 505

x = 505 + 425

x = 930

(x-425)=43935:87

x-425=505

x=505+425

x=930

Vậy x= 930

x-245=43935:87
x-425=505
x=505+425
x=930

\(\frac{1}{8\times9}+\frac{1}{9\times10}+...+\frac{1}{72\times73}\)

\(=\frac{9-8}{8\times9}+\frac{10-9}{9\times10}+...+\frac{73-72}{72\times73}\)

\(=\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}+...+\frac{1}{72}-\frac{1}{73}\)

\(=\frac{1}{8}-\frac{1}{73}=\frac{65}{584}\)

X : 0,1 + X x 7 = 34

X x 10 + X x 7 = 34

X x ( 10 + 7 ) = 34

X x 17 = 34

X = 34 : 17

X = 2

X : 0,1 + X x 7 = 34

X x 10 + X x 7 = 34

X x ( 10 + 7 ) = 34

X x 17 = 34

X = 34 : 17

X = 2

\(x:0,1+x\times7=34\)

\(x:\frac{1}{10}+x\times7=34\)

\(x\times10+x\times7=34\)

   \(x\times\left(10+7\right)=34\)

                 \(x\times17=34\)

                             \(x=34:17\)

                             \(x=2\)

3²⁷>2⁴⁰

lên mạng soạn nha kkk

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