Question

tìm x biết : a) 105 (17x - 34) =0

b) 121:11-(4x+5):3=4

Answer 1

a, 105.(17x-34) = 0

=> 17x-34=0

=> 17x=0+34=34

=>x=34:17=2

=>xϵ{2}

b, 121:11-(4x+5):3=4

=>11-(4x+5)=4.3

=>4x-5=11-12

=>4x-5=-1

=>4x=-1+5

=>4x=4

=>x=4:4=1

=>x∈{1}

Answer 2

a) 105 (17x - 34) =0 b) 121:11-(4x+5):3=4

105(17x - 34) = 1785(x - 2)

1785(x - 2) = 0

1785x = 3570

1785x = 1785 x 2

x= 2

x = 4

Answer 3

a)

\(105\left(17x-34\right)=0\)

\(\Leftrightarrow17x-34=0\)

\(\Leftrightarrow x=\frac{34}{17}=2\)

b)

\(\frac{121}{11}-\frac{\left(4x+5\right)}{3}=4\)

\(\Leftrightarrow\frac{121}{11}-4=\frac{\left(4x+5\right)}{3}\)

\(\Leftrightarrow7=\frac{\left(4x+5\right)}{3}\)

\(\Leftrightarrow21=4x+5\)

\(\Leftrightarrow x=\frac{21-5}{4}=4\)

Answer 4

phần a) ko in đậm là kq của phần a, phần b) in đậm là kq của phần b nhé bn!

Answer 5

Answer 6

a) 105 ( 17x - 34 ) = 0

17x - 34 = 0 : 105

17x - 34 = 0

17x = 0 + 34

17x = 34

x = 34 : 17

x = 2

b) 121 : 11 - (4x + 5 ) : 3 = 4

11 - ( 4x + 5 ) : 3 = 4

(4x + 5 ) : 3 = 11 - 4

( 4x + 5 ) : 3 = 7

4x + 5 = 7 . 3

4x + 5 = 21

4x = 21 - 5

4x = 16

x = 16 : 4

x = 4

Answer 7

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