287-192+x=58*2
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-23 x 63 + 23 x 21 - 58 x 23
= 23 x ( -63 + 21 - 58 )
= 23 x ( -100 )
= -2300
![](https://rs.olm.vn/images/avt/0.png?1311)
TL
58 192 : 16 = 3637 nha bn
#vohuudoan
ht
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x^2-1\right)\left(x+1\right)\left(x+3\right)\)
\(=\left(x-1\right)\left(x+1\right)\left(x+1\right)\left(x+3\right)\)
\(=\left(x-1\right)\left(x+1\right)^2\left(x+3\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,\(\int\limits^{\frac{\Pi}{6}}_0\frac{sin\left(2x+x\right)}{cos^2x}dx=\int\limits^{\frac{\Pi}{6}}_0\frac{sin2x.cosx+cos2x.sinx}{cos^2x}dx=\int\limits^{\frac{\Pi}{6}}_0\frac{2cos^2x.sinx+\left(2cos^2x-1\right)sinx}{cos^2x}dx=\int\limits^{\frac{\Pi}{6}}_0\frac{4cos^2x.sinx}{cos^2x}dx+\int\limits^{\frac{\Pi}{6}}_0\frac{d\left(cosx\right)}{cos^2x}=\int\limits^{\frac{\Pi}{6}}_0sinxdx-\frac{1}{cosx}\)
thay cận vào nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
287+(-96) + (-287) + 36
=(287 - 287 ) + (-96 + 36 )
= 0 + ( -60)
= -60
![](https://rs.olm.vn/images/avt/0.png?1311)
192 x 81 + 192 x 18 + 192
= 192 x ( 81 + 18 + 1 )
= 192 x 100
= 19 200.
192 x 81 + 192 x 18 + 192
= 192 x ( 81 + 18 ) + 192
= 192 x 99 + 192
= 19008 + 192
= 19200
k nhé Nguyễn Việt Thái
95+x=116
x=116-95
x=21
95+x=116
x=116-95
x=21