TÌM X BIẾT :
A, X.7/2=7/9 B,X:8/5=5/2
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Ta có f(x) = g(x)
\(-3x^2+2x+1=-3x^2+x-2\Leftrightarrow x=-3\)
bài giải
s cái ao hình tròn là
50*50*3.14= 7850 (m)
số cây trồng được là
7850/2=3925(m2)
đ/s: 3925 m2
`Answer:`
\(\text{lim }\frac{2.4^n+1}{1-4^{n+2}}\)
Chia cả tử và mẫu cho `4^n` được:
\(\text{lim }\frac{2.4^n+1}{1-4^{n+2}}\)
\(=\text{lim }\frac{\frac{2.4^n+1}{4^n}}{\frac{1-4^{n+2}}{4^n}}\)
\(=\text{lim }\frac{2+\frac{1}{4^n}}{\frac{1}{4^n}-4^2}\)
\(=\frac{2+0}{0-4^2}\)
\(=-\frac{1}{8}\)
TL
a) X. 7/2=7/9
X=7/9:7/2
X=2/9
b) X.:8/5=5/2
X=5/2.8/5
X=4
HT
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