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a)17.65+17.35-x=1570
17.(65+35)-x=1570
17.100-x=1570
1700-x=1570
x=1700-1570=130
b)x+16.14+9.4=7.9.12+63.88
x+224+36=756+5544
x+260 =6300
x=6300-260=6040
c)x.2^3=2^6
x =2^6:2^3
x =2^3=8
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\(3\cdot\left(x-2\right)^2=2+25\)
\(\Leftrightarrow3\cdot\left(x-2\right)^2=27\)
\(\Leftrightarrow\left(x-2\right)^2=9\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=3\\x-2=-3\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=5\\x=-1\end{cases}}\)
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\(\frac{x}{2}+x+\frac{x}{3}+x+x+\frac{x}{4}=\frac{23}{12}\)
\(\left(\frac{x}{2}+\frac{x}{3}+\frac{x}{4}\right)+\left(x+x+x\right)=\frac{23}{12}\)
\(\frac{3x}{12}+\frac{36x}{12}=\frac{23}{12}\)
\(\frac{49x}{12}=\frac{23}{12}\)
\(\frac{49}{12}.x=\frac{23}{12}\)
\(x=\frac{23}{12}:\frac{49}{12}=\frac{23}{49}\)
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Ta có (x+2)3 = (x+2)2
=> x+2=1 nên x=-1 hoặc x+2=0 nên x=-2
ko bik đúng hay sai!!!!!!!!!!!!!!!!!!!!!
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4/7x-2/3=1/5
4/7x=1/5+2/3
4/7x=3/15+10/15
4/7x=13/15
x=13/15:4/7
x=91/60
vay x=91/60
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\(x+17\times4+8\times4=7\times9\times12+63\times88\)
\(\Rightarrow x+4\times\left(17+8\right)=63\times\left(12+88\right)\)
\(\Rightarrow x+4\times25=63\times100\)
\(\Rightarrow x+100=6300\)
\(\Rightarrow x=6200\)
Vậy x = 6200
88-3.(7+x)=64
3(7+x) = 88-64
3(7+x) = 24
7+x = 24:3
7+x = 8
x= 8-7
x=1
88-3(7+x)=64
3(7+x)=88-64
3(7+x)=24
7+x=24:3
7+x=8
x=8-7
x=1
Vậy x=1