Cách làm cho bạn:
Ta có:
a) $x+2 . \sqrt{16}=−3 . \sqrt{49}$;
=>$x+8=-21$
=> $x=-29$
b) $2x − \sqrt{1,69} = \sqrt{1,21}$
=>$2x-1,3=1,1$
=>$x=1,2$
c)$5 . (\sqrt{\frac{1}{25}}−x)−\sqrt{\frac{1}{81}}=−\frac{1}{9}$
=>$ 5.(\sqrt{\frac{1}{5}}−x)=0$
=>$x= \frac{1}{5}$
d)$2+\frac{1}{6}−x=10 . \sqrt{0,01}−\sqrt{\frac{25}{36}}$
=>$2+\frac{1}{6}−x=10.0,1−\frac{5}{6}$
=> $2+\frac{1}{6}−x=1−\frac{5}{6}$
=> $x = 2$
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