giúp khẩn lm ơn giúp vs PHẢI LÀM ĐÚNG 100% nhé lm ơn Bài 4: Tìm số tự nhiên x, biết

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2)                                                                                                

95-5.(x+2)=45                                                                       

⇔5.(x+2)=95-45

⇔5.(x+2)=50

⇔x+2=50:5

⇔x+2=25

⇔x=25-2

⇔x=23

Vậy x=23

14)

(3Xx-16).6=2.42

⇔(3Xx-16).6=84

⇔3Xx-16=84:6

⇔3Xx-16=14

⇔3Xx=14+16

⇔3Xx=30

⇔x=30:3

⇔x=10

Vậy x=10

11)

10+2.x=256:128                                                                                                               

⇔10+2.x=2                                                                                                             

⇔2.x=2-10

⇔2.x=-8

⇔x=(-8):2

⇔x=-4

Vậy x=-4

5)

130-(100+x)=25

⇔100+x=130-25

⇔100+x=105

⇔x=105-100

⇔x=5

Vậy x=5

8)155-10.(x+1)=55

⇔10.(x+1)=155-55

⇔10.(x+1)=100

⇔x+1=100:10

⇔x+1=10

⇔x=10-1

⇔x=9

Vậy x=9

11)

95-5.(x+2)=45

⇔5.(x+2)=95-45

⇔5.(x+2)=50

⇔x+2=50:5

⇔x+2=25

⇔x=25-2

⇔x=23

Vậy x=23

14)

(3Xx-16).6=2.42

⇔(3Xx-16).6=84

⇔3Xx-16=84:6

⇔3Xx-16=14

⇔3Xx=14+16

⇔3Xx=30

⇔x=30:3

⇔x=10

Vậy x=10