67.(476-67)=27403

a.\(3x-20=2^3.5\)
\(3x-20=40\)
\(3x=60\)
\(x=20\)
b.\(3x-9=3^2\)
\(3x=18\)
\(x=6\)
c.\(26-2x=2^2\)
\(2x=22\)
\(x=11\)

C

B

câu bị động mà

C

B

\(\dfrac{a}{3}=\dfrac{b}{2}=\dfrac{c}{7}=\dfrac{c-a}{7-3}=\dfrac{16}{4}=4\)
\(=>a=12 \)
\(=>b=8\)
\(=>c=28\)

a.gọi hstl là k ta có
k=4.10=40
b.y=\(\dfrac{k}{x}\)
c.\(y=\dfrac{40}{5}=8\)
\(y=\dfrac{40}{-8}=\left(-5\right)\)

=0