cho
P(x)= x100 - 4x99 -20x98-4x97-20x96-...-4x3-20x2-4x
tính P(7)
Rút gọn
5x2y( 3x3- 4y +5xy) - 15x5y + ×20x2 y2
Thực hiện phép chia
( 8 x5 y2 + 4x3 y3- 2x6 y2) ÷ 2x3 y
`#3107.101107`
`5x^2y(3x^3 - 4y + 5xy) - 15x^5y + 20x^2y^2`
`= 15x^5y - 20x^2y^2 + 25x^3y^2 - 15x^5y + 20x^2y^2`
`= (15x^5y - 15x^5y) + (-20x^2y^2 + 20x^2y^2) + 25x^3y^2`
`= 25x^3y^2`
_______
`(8x^5y^2 + 4x^3y^3 - 2x^6y^2) \div 2x^3y`
`= 4x^2y + 2y^2 - x^3y`
BÀI TẬP PHÂN TÍCH ĐA THỨC THÀNH NHÂN TỬ BẰNG PHƯƠNG PHÁP ĐẶT NHÂN TỬ CHUNG
1) xy3 – x3y
2) 15xy + 20x2 – 30x
3)6x – 3xy
4)x3 + 2x2 + x
5)4x3 – 12x2 + 9x
6)2x2y + 4xy2 – 10 x3y2
7)x4 + 2x3 + x2
11)x(x – 1) – y(1 – x)
1, \(xy^3-x^3y=xy\left(y^2-x^2\right)=xy\left(y-x\right)\left(x+y\right)\)
2, \(5x\left(3y+4x-6\right)\)
3, \(3x\left(2-y\right)\)
4, \(x\left(x^2+2x+1\right)=x\left(x+1\right)^2\)
5, \(x\left(4x^2-12x+9\right)=x\left(2x-3\right)^2\)
6, \(2xy\left(x+2y-5x^2y\right)\)
7, \(x^2\left(x^2+2x+1\right)=x^2\left(x+1\right)^2\)
11, \(\left(x+y\right)\left(x-1\right)\)
\(1,xy^3-x^3y=xy\left(y^2-x^2\right)=xy\left(y-x\right)\left(y+x\right)\\ 2,15xy+20x^2-30x=5x\left(3y+4x-6\right)\\ 3,6x-3xy=3x\left(2-y\right)\\ 4,x^3+2x^2+x=x\left(x^2+2x+1\right)=x\left(x+1\right)^2\\ 5,4x^3-12x^2+9x=x\left(4x^2-12x+9\right)=x\left(2x-3\right)^2\\ 6,2x^2y+4xy^2-10x^3y^2=2xy\left(x+2y-5x^2y\right)\\ 11,x\left(x-1\right)-y\left(1-x\right)=x\left(x-1\right)+y\left(x-1\right)=\left(x-1\right)\left(x+y\right)\)
cho x1,x2,x3,......,x100, x101
biết x+x2+x3+...........+x100+x101=0và x1+x2=x3+x4=.................=x99+x100=x100+x101
giúp mình với
Cho phép tính sau: (25+7) : (56−25)× ( 8 : 3) :2+64 ×3%
Phép tính nào thực hiện được trong chương trình bảng tính?
A.
=(25+7)/(56-25)x(8/3)/2+6^4x3%
B.
=(25+7)/(56-2^5)x(8/3):2+6^4x3%
C.
=(25+7)/(56-25)*(8/3)/2+64* 3%
D.
=(25+7)/(56-2/5)x(8/3)/2+6^4x3%
a, 13 x 100 + 2 x 100 -9 x100 b, 10 - 8 + 9 - 7 + 6 - 4 + 5 - 3 +2 - 0
`a,`
`13 \times 100 + 2 \times 100 - 9 \times 100`
`= 100 \times (13+2-9)`
`= 100 \times 6`
`= 600`
`b,`
`10 - 8 + 9 - 7 + 6 - 4 + 5 - 3 +2 - 0`
`= (10-8)+(9-7)+(6-4)+(5-3)+2`
`= 2+2+2+2+2`
`= 10`
1, tính nhanh
4 x 126 x 26134 x100 + 250 x 100 -84 x100
làm hộ tui nha !
=4 x 126 x 26140 + 2500 -8400
=13174560 +2500 -8400
=13168660
= 4x126x 100( 26134+ 250 -84)
= 504 x 12630000
= 1325520000
Tìm x:
a) 64x5-4x3=0
b) x3-81x=0
c) x(5-3x)-5+3x=0
d) 4x3+12x2-9x-27=0
e) x4-6x2+7=0
Tìm x:
a) 64x5-4x3=0
b) x3-81x=0
c) x(5-3x)-5+3x=0
d) 4x3+12x2-9x-27=0
e) x4-6x2+7=0
.Rút gọn phân thức:
a) a3(a-5) / a-5 b)3(b+7)4 / 8(b+7)6 c) 15x(x+5)2 / 20x2(x+5)
d) x3-4x2 / y(x-4) e) 5(a-2c)2 / 2a2-4ac
a) \(\dfrac{a^3\left(a-5\right)}{a-5}=a^3 \)
b) \(\dfrac{3\left(b+7\right)4}{8\left(b+7\right)6}=\dfrac{12\left(b+7\right)}{48\left(b+7\right)}=\dfrac{1}{4}\)
c) \(\dfrac{15x\left(x+5\right)^2}{20x^2\left(x+5\right)}=\dfrac{15x}{20x^2}=\dfrac{3}{4x}\)
d) \(\dfrac{x^3-4x^2}{y\left(x-4\right)}=\dfrac{x^2\left(x-4\right)}{y\left(x-4\right)}=\dfrac{x^2}{y}\)
e) \(\dfrac{5\left(a-2c\right)^2}{2a^2-4ac}=\dfrac{5\left(a-2c\right)^2}{2a\left(a-2c\right)}=\dfrac{5\left(a-2c\right)}{2a}=\dfrac{5a-10c}{2a}\)
thuận tiện 19/20x2/100+19/20x2/100
75/76x102/100-75/76x2/100
3x7/10+7/10x5+2x7/10
giá trị biểu thức
2/5+2/3x3/4
1/2x1/3-1/8
(1/2+1/3):3/9
19/20x2/100+19/20x2/100
= [19/20+19/20]x2/100
= 38/20x2/100
= 19/500
75/76x102/100-75/76x2/100
= [102/100-2/100]x75/76
= 1x75/76
= 75/76
3x7/10+7/10x5+2x7/10
= [3+5+2]x7/10
= 10x7/10
= 7
giá trị biểu thức
2/5+2/3x3/4
= 2/5+1/6
= 17/30
1/2x1/3-1/8
= 1/6-1/8
= 1/24
[1/2+1/3]:3/9
= 5/6:3/9
= 5/2
nhớ tick cho tớ nhé