vì (x*3-1):84=42(dư 83) nên x*3-1=42.84+83
suy ra x*3-1=3611
suy ra x*3 =3612
suy ra x=\(\sqrt[3]{3612}\)
Ta có:\(\left(x\times3-1\right):84=42\)(dư 83(
\(\Rightarrow\left(x\times3-1-83\right):84=42\)
\(\Rightarrow\frac{x\times3}{84}-1=42\)
\(\Rightarrow\frac{x\times3}{84}=43\Rightarrow\frac{x}{27}=43\)
\(\Rightarrow x=43\times27=.....\)