Question

Tìm x:

a) 28(2x + 3) = 196

b) 28,6 + x = 30

c) 2(x + 2) = 26

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Answer 1

a)\(28\left(2x+3\right)=196\)

\(\Leftrightarrow56x+84=196\)

\(\Leftrightarrow56x=112\)

\(\Leftrightarrow x=2\)

b)\(28,6+x=30\)

\(\Leftrightarrow x=30-28,6\)

\(\Leftrightarrow x=1,4\)

c)\(2\left(x+2\right)=26\)

\(\Leftrightarrow2x+4=26\)

\(\Leftrightarrow2x=22\)

\(\Leftrightarrow x=11\)

 #hoktot<3# 

Answer 2

a) \(28\left(2x+3\right)=196\)

\(\Leftrightarrow56x+84=196\)

\(\Leftrightarrow56x=196-84\)

\(\Leftrightarrow56x=112\)

\(\Leftrightarrow x=2\)

b) \(28,6+x=30\)

\(\Leftrightarrow x=30-28,6\)

\(\Leftrightarrow x=1,4\)

c) \(2\left(x+2\right)=26\)

\(\Leftrightarrow2x+4=26\)

\(\Leftrightarrow2x=26-4\)

\(\Leftrightarrow2x=22\)

\(\Leftrightarrow x=11\)