55 x 33 :15
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33 x 55 + 33 x 66 - 33 x 21
= 33 x ( 55 + 66 - 21 )
= 33 x 100
= 3300
\(a,16-3^3:9-2^3:2-19\\ =16-27:9-2^2-19\\ =16-3-4-19\\ =13-4-19\\ =9-19\\ =-10\\ b,136-\left(55-63-15\right)-\left(27-36\right)\\ =136-\left(-8-15\right)-\left(-9\right)\\ =136-\left(-23\right)+9\\ =159+9\\ =168\)
a: =16-3-4-19
=16-7-19
=9-19=-10
b: =136-40+63-27+36
=168
\(a,|x|+|-9|=15\)
\(|x|=6\)
\(\Rightarrow\orbr{\begin{cases}x=6\\x=-6\end{cases}}\)
\(b,|+33|+|x|=|-55|\)
\(33+|x|=55\)
\(|x|=22\)
\(\Rightarrow\orbr{\begin{cases}x=22\\x=-22\end{cases}}\)
\(c,|-9|.|-x|=|-81|\)
\(9.|-x|=81\)
\(|-x|=9\)
\(\Rightarrow\orbr{\begin{cases}x=9\\x=-9\end{cases}}\)
\(d,|x|+20=2.|-7|\)
\(|x|+20=14\)
\(|x|=-6\)
\(\Rightarrow\orbr{\begin{cases}x=-6\\x=6\end{cases}}\)
a,|x|+|-9|=15
| x | + 9 = 15
| x | = 6
Vậy \(x=\pm6\)
b,|+33|+|x|=|-55|
33 + | x | = 55
| x | = 22
vậy \(x=\pm22\)
c,|-9|.|-x|=|-81|
9. | -x| = 81
| -x| = 9
Vậy x= 9
d,|x|+20=2.|-7|
|x| + 20 = -14
| x | = -34(Vô lí)
hok tốt!!!
50) \(\sqrt{98-16\sqrt{3}}=4\sqrt{6}-\sqrt{2}\)
51) \(\sqrt{2-\sqrt{3}}=\dfrac{\sqrt{4-2\sqrt{3}}}{\sqrt{2}}=\dfrac{\sqrt{3}-1}{\sqrt{2}}=\dfrac{\sqrt{6}-\sqrt{2}}{2}\)
52) \(\sqrt{4+\sqrt{15}}=\dfrac{\sqrt{8+2\sqrt{15}}}{\sqrt{2}}=\dfrac{\sqrt{5}+\sqrt{3}}{\sqrt{2}}=\dfrac{\sqrt{10}+\sqrt{6}}{2}\)
53) \(\sqrt{5-\sqrt{21}}=\dfrac{\sqrt{10-2\sqrt{21}}}{\sqrt{2}}=\dfrac{\sqrt{14}-\sqrt{6}}{2}\)
54) \(\sqrt{6-\sqrt{35}}=\dfrac{\sqrt{12-2\sqrt{35}}}{\sqrt{2}}=\dfrac{\sqrt{14}-\sqrt{10}}{2}\)
55) \(\sqrt{2+\sqrt{3}}=\dfrac{\sqrt{4+2\sqrt{3}}}{\sqrt{2}}=\dfrac{\sqrt{6}+\sqrt{2}}{2}\)
56) \(\sqrt{4-\sqrt{15}}=\dfrac{\sqrt{8-2\sqrt{15}}}{\sqrt{2}}=\dfrac{\sqrt{10}-\sqrt{6}}{2}\)
11x11=121
22x22=484
33x33=1089
44x44=1936
55x55=3025
66x66=4356
k mk nhé,1000000% đúng
121 nha bạn
55x33:15=121
k nha ban