a: \(A=\left(5xy-2xy+1.3xy\right)+3x-2y-3.5y^2\)
\(=4.3xy+3x-2y-3.5y^2\)
b: \(B=\left(\dfrac{1}{2}ab^2-\dfrac{1}{2}ab^2-\dfrac{7}{8}ab^2\right)+\left(\dfrac{3}{4}a^2b-\dfrac{3}{8}a^2b\right)\)
\(=-\dfrac{7}{8}ab^2+\dfrac{3}{8}a^2b\)
c: \(C=\left(2a^2b+5a^2b\right)+\left(-8b^2-3b^2\right)+\left(5c^2+4c^2\right)\)
\(=7a^2b-11b^2+9c^2\)
Thu gọn đa thức sau :
a) A= 5xy - 3,5y2 - 2xy +1,3xy +3x - 2y
b) B= \(\dfrac{1}{2}\)ab2 - \(\dfrac{7}{8}\)ab2 + \(\dfrac{3}{4}\)a2b - \(\dfrac{3}{8}\)a2b - \(\dfrac{1}{2}\)ab2
c) C= 2 a2b - 8b2 + 5a2b + 5c2 - 3b2 + 4c2
Các cậu giúp mình với
Cảm ơn
Bài 4: Tìm x,y nguyên biết
b,xy+3x-y=6
c,x-2xy+y-3=0
d,\(2x+\dfrac{1}{7}\)=\(\dfrac{1}{y}\)
Bài 5: Cho :\(\dfrac{2a+b+c+d}{a}+\dfrac{2b+c+d+a}{b}+\dfrac{2c+a+b+d}{c}+\dfrac{2d+c+b+a}{d}\)
Tính M=\(\dfrac{a+b}{c+d}+\dfrac{b+c}{d+a}+\dfrac{c+d}{a+b}+\dfrac{d+a}{b+c}\)
Bài 6 : Tìm x,y biết:
a,\(\dfrac{x}{2}=\dfrac{y}{4}\) và \(x^2y^2=2\)
b,4x=7y và \(x^2+y^2=260\)
Bài 7:Tìm x biết:
a,\(\left|x=2020\right|+\left|x-2018\right|=2019\)
b,\(\dfrac{1}{4}.\dfrac{2}{6}.\dfrac{3}{8}.\dfrac{4}{10}.\dfrac{5}{12}...\dfrac{30}{62}.\dfrac{31}{64}=2^x\)
Bài 8: Cho \(\dfrac{x}{2}=\dfrac{y}{3};\dfrac{y}{4}=\dfrac{\text{z}}{5}\)
Tính M=\(\dfrac{2x+3y-\text{z}}{5x-4y+3\text{z}}\)
Bài 9: Tìm GTNN
A=\(2x^2+2y^2+2xy-14x-16y-2056\)
a,\(\dfrac{8^{20}+4^{20}}{4^{25}+64^5}\)
b,\(\left(1+\dfrac{2}{3}-\dfrac{1}{4}\right).\left(\dfrac{4}{5}-\dfrac{3}{4}\right)^2\)
c,\(23\dfrac{1}{3}:\left(\dfrac{-5}{7}\right)-13\dfrac{1}{3}:\left(\dfrac{-5}{7}\right)\)
d,1:\(\left(\dfrac{2}{3}-\dfrac{3}{4}\right)^2\)
e,\(\dfrac{45^{10}.5^{20}}{75^{15}}\)
So sánh:
a) A = \(\dfrac{1}{2^1}+\dfrac{1}{2^2}+\dfrac{1}{2^3}+...+\dfrac{1}{2^{49}}+\dfrac{1}{2^{50}}\) với 1
b) B = \(\dfrac{1}{3^1}+\dfrac{1}{3^2}+\dfrac{1}{3^3}+...+\dfrac{1}{3^{99}}+\dfrac{1}{3^{100}}\) với \(\dfrac{1}{2}\)
c) C = \(\dfrac{1}{4^1}+\dfrac{1}{4^2}+\dfrac{1}{4^3}+...+\dfrac{1}{4^{999}}+\dfrac{1}{4^{1000}}\) với \(\dfrac{1}{3}\)
Cần gấp ạ ^^ Cảm ơn trước ^^
Bài 1: Thu gọn đơn thức ( a là hằng só )
a) \(1\dfrac{1}{4}x^2y\left(\dfrac{-5}{6}xy\right)^0.\left(-2\dfrac{1}{3}xy\right)\)
b) \(\dfrac{1}{2}x.\dfrac{1}{4}x^2.\dfrac{x^3}{8}.2y.4y^2.x^3\)
c) \(\left(\dfrac{-9}{2}\right)^3.3xy\left(4a^2x^3\right)\left(4\dfrac{1}{3}ay^2\right)\)
d) \(\left(\dfrac{1}{3}xy^2\right)^3\left(\dfrac{-3}{7}x^4y\right)^2\)
a,\(\left(3x-2\right):1\dfrac{2}{5}=2\dfrac{3}{7}:2\dfrac{3}{5}\)
b,\(\dfrac{31-2x}{x+23}=\dfrac{9}{4}\)
c,\(\dfrac{x+3}{8}=\dfrac{2}{x-3}\)
d,\(\dfrac{-1,64}{8,51}=\dfrac{\left|x\right|}{-3,11}\)
giúp mình với
gấp gấp lắm
1/ tìm x
a) \(x.\left(x+\dfrac{2}{3}\right)=0\)
2/tìm giá trị nhỏ nhất của các biểu thức
a) \(\left|x+\dfrac{4}{6}\right|\)
b) \(\left|x-\dfrac{1}{3}\right|\)
3/ tính
a) \(\left(1+2+3+...90\right).\left(12.34-668\right):\left(\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{1}{6}\right)\)
b) \(\dfrac{\dfrac{3}{7}-\dfrac{3}{11}+\dfrac{3}{13}}{\dfrac{5}{7}-\dfrac{5}{11}+\dfrac{5}{13}}+\dfrac{\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{4}}{\dfrac{5}{4}-\dfrac{5}{6}+\dfrac{5}{8}}\)
1.thực hiện phép tính
a.\(\dfrac{-5}{21}-\dfrac{1}{3}+3\dfrac{1}{2}.\left(\dfrac{-2}{3}\right)^3\)
b)\(-2\dfrac{1}{3}+\left(\dfrac{3}{8}-\dfrac{3}{4^{^{ }}}\right)^3:\dfrac{5}{9}-\dfrac{1}{2}\)
c)\(\left(6-2\dfrac{4}{5}\right).3\dfrac{1}{8}-1\dfrac{3}{5}:\left(-\dfrac{1}{2}\right)^2\)
d)\(-\dfrac{3}{7}.\dfrac{5}{9}+\dfrac{4}{7}.\dfrac{-1}{3}-\left(0,5\right)^3\)
e)\(\dfrac{15}{5}-\dfrac{2}{17}+\dfrac{15}{23}-\dfrac{15}{17}+\dfrac{4}{19}\)
Giúp mik nha mai mik phải nộp bài cho thầy rùi nì
a) 2\(\dfrac{2}{7}\)x - \(\dfrac{5}{8}\)=\(\dfrac{17}{24}\)
b) -1 - \(\dfrac{1}{2}\) - \(\dfrac{1}{4}\) - \(\dfrac{1}{8}\) . . . \(\dfrac{1}{1024}\)
c) \(1\dfrac{1}{24}\). \(3\dfrac{3}{8}\) : \(3\dfrac{3}{4}\)
