9

9

9

(x:3-4).5=15

(x:3-4)=3

x:3=7

x= 21

(7-x)-(25+7)=-25

(7-x)-32=-25

7-x=7

=> x= 0

a) \(\left(\frac{x}{3}-4\right).5=15\)

\(\left(\frac{x}{3}-4\right)=\frac{15}{5}\)

\(\frac{x}{3}-4=3\)

\(\frac{x}{3}=3+4\)

\(\frac{x}{3}=7\)

\(x=7.3\)

\(x=21\)

b) \(\left(7-x\right)-\left(25+7\right)=-25\)

\(7-x-25-7=-25\)

\(-x-25=-25\)

\(-x=-25+25\)

\(-x=0\)

\(x=0\)

2x-51:17=5

2x-51     =5.17

2x-51     =85

2x          =85+51

2x          =136

x            =136:2

x            68

k mik nha

2x-51:17=5

2x-3=5

2x=8

x=4

Vậy x=4

2x - 51 : 17 = 5

2x - 51        = 85

2x                = 136

  x                = 68

2x-51:17=5

2x-3=5

2x=8

x=4

tk nha

\(\left(\dfrac{3}{4}+\dfrac{9}{8}\right)\cdot8=\dfrac{3}{4}\cdot8+\dfrac{9}{8}\cdot8=6+9=15\)

\(\left(\dfrac{3}{4}+\dfrac{9}{8}\right)\cdot8=\dfrac{3\cdot2+9}{8}\cdot8=3\cdot2+9=15\)

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