Question

[Nghiêm Vũ Thanh Thủy]

( x - 36 ) : 18 = 3

415 - 9 * ( x + 2 ) = \(2^2\) * \(5^2\)

5 * ( 4+6 * x ) = 290

 bạn nào giúp mình nha !!!!!!

Answer 1

[Trí Tiên亗]

\(\left(x-36\right):18=3\Leftrightarrow x-36=54\Leftrightarrow x=90\)

\(415-9\left(x+2\right)=2^2.5^2\Leftrightarrow415-9\left(x+2\right)=100\Leftrightarrow9\left(x+2\right)=315\Leftrightarrow x+2=35\Leftrightarrow x=33\)

\(5\left(4+6x\right)=290\Leftrightarrow4+6x=58\Leftrightarrow6x=54\Leftrightarrow x=9\)

Answer 2

[Bellion]

             Bài làm :

\(\left(x-36\right)\div18=3\)

\(\Leftrightarrow x-36=3\times18\)

\(\Leftrightarrow x-36=54\)

\(\Leftrightarrow x=54+36=90\)

\(415-9\times\left(x+2\right)=2^2\times5^2\)

\(\Leftrightarrow415-9\times x-9\times2=\left(2\times5\right)^2\)

\(\Leftrightarrow415-9\times x-18=10^2\)

\(\Leftrightarrow397-9\times x=100\)

\(\Leftrightarrow9\times x=397-100\)

\(\Leftrightarrow9\times x=297\)

\(\Leftrightarrow x=297\div9=33\).

\(5\times\left(4+6\times x\right)=290\)

\(\Leftrightarrow4+6\times x=290\div5\)

\(\Leftrightarrow4+6\times x=58\)

\(\Leftrightarrow6\times x=58-4\)

\(\Leftrightarrow6\times x=54\)

\(\Leftrightarrow x=54\div6=9\)

Chúc bạn học tốt !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!