Làm tính nhân
a) \(\left(-5x^2\right)\left(3x^3-2x^2+x-1\right)\)
\(=-15x^5+10x^4-5x^3+5x^2\)
b) \(\left(-4^3+\frac{2}{3}y-\frac{1}{4}yz\right)\left(-\frac{1}{2}xy\right)\)
\(=\left(-64+\frac{2}{3}y-\frac{1}{4}yz\right)\left(-\frac{1}{2}xy\right)\)
\(=32xy-\frac{1}{3}xy^2+\frac{1}{8}xy^2z\)
Bài 1: a) Tính tổng \(M=3\frac{1}{417}.\frac{1}{762}-\frac{1}{139}.4\frac{761}{762}-\frac{4}{417.762}+\frac{5}{139}\)
b, Tính giá trị của đa thức sai tại x=-1 : \(x^2+x^4+x^6+x^8+....+x^{100}\)
tìm x
a) x+10=25
b)\(\frac{2}{3}\)x-\(\frac{1}{2}\)=\(\frac{1}{10}\)
c)\(\frac{x}{7}\)=\(\frac{-6}{21}\)
d)|\(\frac{2}{3}\)x-\(\frac{1}{2}\)|=\(\frac{5}{6}\)
(1+2+3+4+...+100)\(\times\)(18,34-9,68):(\(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{100}\))
Giúp mik với!~~~
cho \(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)
tinh P=\(\frac{y+z-x}{x-y+z}\)
\(\frac{4}{9}:\left(\frac{-1}{7}\right)+6\frac{5}{9}.\left(\frac{2}{3}\right)\)
tìm x biet
\(\frac{1}{x}< 2va\frac{1}{x}>-3\)
\(S^2:\)
\(\left(\frac{-1}{5}\right)^{300}\)và \(\left(\frac{-1}{3}\right)^{500}\)
D=(\(\frac{-1}{9}^3\)).\(a^6\).\(b^9\).\(c^3\)
D= \(\left(\frac{-1}{729}\right)\).\(a^6.b^9.c^3\)
a. 4/5*(7/2+1/4)^2
b.(x-1/5)^2004+(y+0,4)^100+(z-3)^678=0
