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fil in the correct form of the words in blackets( AS...........AS)
1. Jonh is ( tall)..........................Glen
2.Janet is ( beautiful) .............jenifer
3.You are (crazy ) .....................my sister
4.We are run(fast)...........they can
5.my mom is (not/strict)..........your mom
6. Your mobile phone is ( not/ expensve ) ........................mine
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1. a) 1012 = (100 + 1)2 = 1002 + 2.100 + 1 = 10201
b) 10012 = (1000 +1)2 = 10002 + 2.1000 + 1 = 1002001
2. a) (x + 2)2 - 9 = 0
<=> (x + 2)2 = 9
<=> x + 2 = 3 hoặc x + 2 = -3
*x + 2 = 3 => x = 1
*x + 2 = -3 => x = -5
Vậy x = 1; x = -5
b) x2 - 2x + 1 = 25
<=> (x - 1)2 = 25
<=> x - 1 = 5 hoặc x - 1 = -5
*x - 1 = 5 => x = 6
*x - 1 = -5 => x = -4
Vậy x = 6; x = -4
**Tái bút : em mới học lớp 6 lên lớp 7 chị nhé!**
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\(18x^2y^2\left(?\right)4x^2y\)
câu b)
\(\left(b\right)6x^3-9x^2=3x^2\left(x-3\right)\)
\(\left(c\right)4x^2-1=\left(2x-1\right)\left(2x+1\right)\)
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99.100 = 9900
(20.1)2 = 202 = 400
732 - 272 = (73 - 27).(73 + 27) = 46.100 = 4600
Ủng hộ mk nha ^_-
99,100=9900
(20,1) \(^2\)=20\(^2\) =400
73\(^2\) -27\(^2\) =(73-27),(73+27)=46,100=4600
ủng hộ giùm nha ^^
+)138^2-38^2=(100+38)^2-38^2=100^2+2.100.38+38^2-38^2
=10000+7600
=17600