Make questions to the underlines works:
We went to school by bus.
->__________________________.
Complete the sentences:
Where does he live?
-> What______________________.
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\(25.\left(\frac{1}{5}\right)^3+\frac{1}{5}-4\left(-\frac{1}{2}\right)^2-\frac{1}{2}\)
\(=\frac{25}{125}+\frac{1}{5}-4.\frac{1}{4}-\frac{1}{2}\)
\(=\frac{1}{5}+\frac{1}{5}-1-\frac{1}{2}\)
\(=1-1-\frac{1}{2}=-\frac{1}{2}\)
<=> \(\frac{1}{5}-\frac{1}{5}-\frac{1}{2}=-\frac{1}{2}\)
\(\frac{a^3}{a^2+b^2}+\frac{b^3}{b^2+c^2}+\frac{c^3}{c^2+a^2}=a-\frac{ab^2}{a^2+b^2}+b-\frac{bc^2}{b^2+c^2}+c-\frac{ca^2}{c^2+a^2}\)
\(\ge a-\frac{ab^2}{2ab}+b-\frac{bc^2}{2bc}+c-\frac{ca^2}{2ca}=a-\frac{b}{2}+b-\frac{c}{2}+c-\frac{a}{2}=\frac{a+b+c}{2}\)
cau a : (3x^2y-6xy+9x)(-4/3xy)
=-4/3xy.3x^2y+4/3xy.6xy-4/3xy.9x
=-4x+8-8y
cau b : (1/3x+2y)(1/9x^2-2/3xy+4y^2)
=(1/3)^3-2/9x^2y+8y^3+4/3xy^2+2/9x^2y-4/3xy^2+8y^3
=(1/3)^3 + (2y)^3x-2
cau c : (x-2)(x^2-5x+1)+x(x^2+11)
=x^3-5x^2+x-2x^2+10x-2+x^3+11x
=2x^3-7x^2+22x-2
cau d := x^3 + 6xy^2 -27y^3
cau e := x^3 + 3x^2 -5x - 3x^2y - 9xy = 15y
cau f := x^2-2x+2x -4-2x-1
= x(x-2)-5
(2x-3)( 3/4x+1) = 0
=> 2x-3= 0 hoặc 3/4x +1 = 0
=> 2x= 3 hoặc 3/4x = -1
=> x=3/2 hoặc x= -4/3
(5x-1)(2x-1/3) = 0
=> 5x-1 = 0 hoặc 2x-1/3 = 0
5x =1 hoặc 2x=1/3
x=1/5 hoặc x= 1/6
\(\Leftrightarrow x^2-1+2\sqrt{x}.\sqrt{x^2-1}-3x=0\)
đặt \(\sqrt{x^2-1}=a;\sqrt{x}=b\)
=>a2+2ab-3b2=0
đến đây dễ rồi
Điều kiện -1 =<x<0
Chia cả 2 vế cho x ta nhận được \(x+2\sqrt{x-\frac{1}{x}}=3+\frac{1}{x}\)
Đặt t=\(x-\frac{1}{x}\)ta giải được
Make questions to the underlines works:
We went to school by bus.
--> Are they going to school by car?
Where does he live?
-> What!You don't know where I live!
Câu cuối chế
1.how did we go to school