tim x biet,
5x + 5x+2= 650
Thuc hien phep tinh
(1+2+3+4+...+90).(12.34 - 6.68) : (1/3+1/4+1/5+1/6)
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Thực hiện các phép tính
( 1 +2+3 +...+90 ) . ( 12.34 -6.68) :[ 1/3+1/4+1/5+1/6]
\(\left(\frac{-2}{3}\right)^3-3.\left(\frac{-2}{3}\right)^2-2.\left(\frac{-2}{3}\right)+4\)
(1+2+3+...+90).(12.34-6.68):(1/3+1/4+1/5+1/6)
1) thuc hien phep tinh:
\(\frac{4}{x+2}+\frac{2}{x-2}+\frac{5x-6}{4-x}\)
Ta có :\(\frac{4}{x+2}+\frac{2}{x-2}+\frac{5x-6}{4-x}\)
\(=\frac{4\left(x-2\right)\left(4-x\right)}{\left(x+2\right)\left(x-2\right)\left(4-x\right)}+\frac{2\left(x+2\right)\left(4-x\right)}{\left(x+2\right)\left(x-2\right)\left(4-x\right)}\)\(+\frac{\left(5x-6\right)\left(x+2\right)\left(x-2\right)}{\left(x+2\right)\left(x-2\right)\left(4-x\right)}\)
\(=\frac{24x-8x^2-32}{\left(x+2\right)\left(x-2\right)\left(4-x\right)}+\frac{4x-2x^2+16}{\left(x+2\right)\left(x-2\right)\left(4-x\right)}\)\(+\frac{5x^2+4x-12}{\left(x+2\right)\left(x-2\right)\left(4-x\right)}\)
\(=\frac{24x-8x^2-32+4x-2x^2+16+5x^2+4x-12}{\left(x+2\right)\left(x-2\right)\left(4-x\right)}\)
\(=\frac{32x-5x^2-28}{\left(x+2\right)\left(x-2\right)\left(4-x\right)}\)
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1) thuc hien phep tinh
a) 75-(3.52-4.23)
b)-/-12/+12-(-24)
c)17.85+15.17-120
2) tim x,biet
a)70-5.(x-3)=45
b)x-7=(-14)+(-8)
c)2./x-2/-4=6
d)128:22x-1=4
b.-/-12/+12-(-24)
= - 12 + 12 - 24
=0-24
=-24
c.17.85+15.17-120
=17.(85+15)-120
=17.100-120
=1700-120
=1580
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bài 2: tìm x
a. 70-5.(x-3)=45
5.(x-3)=70-45=25
x-3=25:5=5
x=5+3=8
vậy x=8
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Xem thêm câu trả lời
bai 1 thuc hien phep tinh a)\(\dfrac{\left(\dfrac{1}{x^2+4x+4}-\dfrac{1}{x^2-4x+4}\right)}{\left(\dfrac{1}{x+2}+\dfrac{1}{x-2}\right)}\)
b)\(\left(\dfrac{5x+y}{x^2-5xy}+\dfrac{5x-y}{x^2+5xy}\right)\cdot\dfrac{x^2-25y^2}{x^2+y^2}\)
\(a,=\dfrac{\left(x-2\right)^2-\left(x+2\right)^2}{\left(x-2\right)^2\left(x+2\right)^2}:\dfrac{x-2+x+2}{\left(x-2\right)\left(x+2\right)}\\ =\dfrac{-8x}{\left(x-2\right)^2\left(x+2\right)^2}\cdot\dfrac{\left(x-2\right)\left(x+2\right)}{2x}=\dfrac{-4}{\left(x-2\right)\left(x+2\right)}\)
\(b,=\dfrac{5x^2+26xy+5y^2+5x^2-26xy+5y^2}{x\left(x-5y\right)\left(x+5y\right)}\cdot\dfrac{\left(x-5y\right)\left(x+5y\right)}{x^2+y^2}\\ =\dfrac{10\left(x^2+y^2\right)}{x\left(x^2+y^2\right)}=\dfrac{10}{x}\)
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Bai 1: Thuc hien phep tinha) 2x(3x2-5 X+3). b) -2X ( x2+5x-3). c) --1/2x2(2x3-4x+3).Bai 2 Thuc hien phep tinh.a) (2x-1)(x2+5-4). b) -(5x-4)(2x+3). c) (2x-y)(4x2-2xy+y2).d) (3x-4)(x+4)+(5-x)(2x2+3x-1). e)7x(x-4)-(7x+3)(2x2-x+4)
Đọc tiếp
Bai 1: Thuc hien phep tinh
a) 2x(3x2-5 X+3). b) -2X ( x2+5x-3). c) --1/2x2(2x3-4x+3).
Bai 2 Thuc hien phep tinh.
a) (2x-1)(x2+5-4). b) -(5x-4)(2x+3). c) (2x-y)(4x2-2xy+y2).
d) (3x-4)(x+4)+(5-x)(2x2+3x-1). e)7x(x-4)-(7x+3)(2x2-x+4)
a) 2x(3x^2 -5x + 3) = 6x^3 - 10x^2 + 6x
b) -2x(x^2 +5x-3) = -2x^3 - 10x^2 + 6x
c) 2 dấu trừ liền nhau??
bài 2:
a) \(\left(2x-1\right)\left(x^2+1\right)=2x^3-x^2+2x-1\)
b) \(-\left(5x-4\right)\left(2x+3\right)=-\left(10x^2-8x+15x-12\right)=-10x^2-7x+12\)
c) \(\left(2x-y\right)\left(4x^2-2xy+y^2\right)=8x^3-4x^2y-4x^2y+2xy^2+2xy^2-y^3=8x^3-8x^2y+2xy^2-y^3\)
d) \(\left(3x-4\right)\left(x+4\right)+\left(5-x\right)\left(2x^2+3x-1\right)=3x^2+8x-16+10x^2-2x^3+15x-3x^2-5+x=10x^2+24x-21\)
e) \(7x\left(x-4\right)-\left(7x+3\right)\left(2x^2-x+4\right)=7x^2-28x-\left(14x^3+6x^2-7x^2-3x+28x+12\right)=-14x^2+8x^2-53x-12\)
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\(2x\left(3x^2-5x+3\right)\)
\(=2x.3x^2-2x.5x+2x.3\)
\(=6x^3-10x^2+6x\)
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Thuc hien phep tinh:
a) (7.35 -34 +36 ) : 34
b) (163 - 642 ) :83
Tim so tu nhien n de moi phep chia sau la phep chia het:
a) 5xnn3 :4x2y2
b) xnyn+1 :x2y5
HELP ME!!!!
Thuc hien phep tinh:
a) (7.35 -34 +36 ) : 34
=(1701-81+729):81
=2349:81
=29
b) (163 - 642 ) :83
=(4096-4096):512
=0:512
=0
BÀi 2:
a)n=2
b)n=4
~~~~~~ Ai đi ngang qua nhớ để lại ~~~~~~~~~
Tkanks
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THUC HIEN PHEP TINH ( TINH NHANH NEU CO THE ) :
1) ( 56 x 46 - 25 x 23 ) : 23
2) ( 28 x 54 + 56 x 36 ) : 21 : 2
3) ( 76 x 34 - 19 x 64 ) : ( 38 x 9 )
4) ( 2 + 4 + 6 + .... + 100 ) x ( 36 x 333 - 108 x 111 )
5) ( 5x 411 - 3 x 165 ) : 410
6) 7256 x 4375 - 725
3650 + 4375 x 7255
Tim x: 3.2^x+2^x=16
(3x-2)^2+1/4=1/2
Thuc hien phep tinh: 5.(-0,2)^2+3/8.(9/2-2,5)^2-(-1/5)
Mn giup mk nha
Please