Thực hiện phép tínha)(x+2)2-(x+3)(x-3)+10 b)(5-x)2+(x+5)2-(2x+10)(x-5)a)(x+1)2+(x-2)(x+3)-4x b)(x-2)2+(x+1)2+2(x-2)(-1-x)a)(x-2)(x+2)-(x-3)(x+1) b)(3x-5)2-2(3x-5)(3x+5)+(3x+5)2a)(x+4)2+(x+5)(x-5)-2x(x+1) ...
Đọc tiếp
Thực hiện phép tính
a)(x+2)2-(x+3)(x-3)+10 b)(5-x)2+(x+5)2-(2x+10)(x-5)
a)(x+1)2+(x-2)(x+3)-4x b)(x-2)2+(x+1)2+2(x-2)(-1-x)
a)(x-2)(x+2)-(x-3)(x+1) b)(3x-5)2-2(3x-5)(3x+5)+(3x+5)2
a)(x+4)2+(x+5)(x-5)-2x(x+1) b)(y-3)(y+3)(y2+9)-(y2+2)(y2-2)
a, \(\left(x+2\right)^2-\left(x+3\right)\left(x-3\right)+10=x^2+4x+4-x^2+9+10=4x+23\)
b, \(\left(5-x\right)^2+\left(x+5\right)^2-\left(2x+10\right)\left(x-5\right)=25-10x+x^2+x^2+10x+25-2x^2+50=100\)
a) ( x + 2 )2 - ( x + 3 )( x - 3 ) + 10
= x2 + 4x + 4 - ( x2 - 9 ) + 10
= x2 + 4x + 4 - x2 + 9 + 10
= 4x + 23
b) ( x + 1 )2 + ( x - 2 )( x + 3 ) - 4x
= x2 + 2x + 1 + x2 + x - 6 - 4x
= 2x2 - 2x - 5
c) ( x - 2 )( x + 2 ) - ( x - 3 )( x + 1 )
= x2 - 4 - ( x2 - 2x - 3 )
= x2 - 4 - x2 + 2x + 3
= 2x - 1
d) ( x + 4 )2 + ( x + 5 )( x - 5 ) - 2x( x + 1 )
= x2 + 8x + 16 + x2 - 25 - 2x2 - 2x
= 6x - 9
e) ( 5 - x )2 + ( x + 5 )2 - ( 2x + 10 )( x - 5 )
= 25 - 10x + x2 + x2 + 10x + 25 - ( 2x2 - 50 )
= 2x2 + 50 - 2x2 + 50
= 100
f) ( x - 2 )2 + ( x + 1 )2 + 2( x - 2 )( -1 - x )
= x2 - 4x + 4 + x2 + 2x + 1 + 2( -x2 + x + 2 )
= 2x2 - 2x + 5 - 2x2 + 2x + 4
= 9
g) ( 3x - 5 )2 - 2( 3x - 5 )( 3x + 5 ) + ( 3x + 5 )2
= [ ( 3x - 5 ) - ( 3x + 5 ) ]2
= ( 3x - 5 - 3x - 5 )2
= ( -10 )2 = 100
h) ( y - 3 )( y + 3 )( y2 + 9 ) - ( y2 + 2 )( y2 - 2 )
= ( y2 - 9 )( y2 + 9 ) - [ ( y2 )2 - 4 ]
= [ ( y2 )2 - 81 ] - y4 + 4
= y4 - 81 - y4 + 4
= -77