Question

Bài 1. Tìm số tự nhiên x biết:

a, 91 - 5 . ( 5 + x ) = 61

b, ( x+ 34 ) - 50 = 56 : 2

Answer 1

a, 91 - 5 . ( 5 + x ) = 61

5 . (5+x)=91-61

5 . (5+x)=30

5+x=30:5

5+x=6

x=6-5

x=1

Answer 2

Bài 1. Tìm số tự nhiên x biết:

a, 91 - 5 . ( 5 + x ) = 61

5(5 + x) = 91 - 61

5(5 + x) = 30

5 + x = 30 : 5

5 + x = 6

x = 6-5

x= 1

b, ( x+ 34 ) - 50 = 56 : 2

( x + 34 ) - 50 = 28

x + 34 = 28 + 50

x + 34 = 68

x= 78 - 34

x = 44

Tk mk nha

Answer 3

\(91-5\left(5+x\right)=61\Leftrightarrow5\left(5+x\right)=91-61\)

\(5\left(5+x\right)=30\Leftrightarrow5+x=30:5\Leftrightarrow5+x=15\)

\(x=15-5\Leftrightarrow x=10\)

\(\left(x+34\right)-50=56:2\Leftrightarrow\left(x+34\right)-50=28\)

\(x+34=28+50\Leftrightarrow x+34=78\Leftrightarrow x=78-34\)

\(x=44\)

Answer 4

a)91-5(5+x)=61

<=>91-25-5x=61

<=>66-5x=61

<=>5x=66-61

<=>5x=5

<=>x=1

b)(x+34)-50=56:2

<=>(x+34)-50=28

<=>x+34=78

<=>x=44

Answer 5

a,<=>\(5\left(5+x\right)=30\)

<=>\(5+x=6\)

<=> \(x=1\)

b,<=>\(x+34=28+50\)

<=>\(x=78-34\)

<=>\(x=44\)