Question

Tìm x biết

a , ( 42 x X ) : x -3=3

b , 120+( x+5 ) x6+x=220

Giúp mk với

Answer 1

a)\(\left(42.x\right):x-3=3\)

\(\Leftrightarrow\left(42.x\right):x=6\)

\(\Leftrightarrow42x=6x\)

\(\Leftrightarrow42x-6x=0\)

\(\Leftrightarrow36x=0\)

\(\Leftrightarrow x=0\)

b)\(120+\left(x+5\right).6+x=220\)

\(\Leftrightarrow6x+30+x=100\)

\(\Leftrightarrow7x=70\Leftrightarrow x=10\)

Answer 2

a) 42.x :x − 3 = 3
⇔ 42.x :x = 6
⇔42x = 6x
⇔42x − 6x = 0
⇔36x = 0
⇔x = 0
b)120 + x + 5 .6 + x = 220
⇔6x + 30 + x = 100
⇔7x = 70⇔x = 10

k cho mk nha mk ko chép mạng đâu @@@