Question

Doar cele încercuite va rog mult.Dau steluta ​

Answer 1

3. a+b=69

a:b=7 r 5

a=7b+5

7b+5+b=69

8b+5=69

8b=64

b=8

a=7×8+5=61

v=61+8=69

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4.a-b=161

a:b=19 r 17

a=19b +17

19b+17-b=161

18b+17=161

18b=144

b=8

a=19×8+17=169

v=169-8=161

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10. a+b+c=1272

a:b=4 r 21

c= 1/4b-9

=> a =4b+21

4b+21+(1/4b-9)+b=1272

5b+21+ (1/4b-9)= 1272|-21

5b+(1/4b-9)=1251

1/4b-9=1251-5b|+9

1/4b=1260-5b|+5b

1/4b+20b/4=1260

21b/4=1260/1

21b=1260×4=5040

b=5040÷21=240

a=4b+21=4×240+21=981

c=1/4b+9

= 1/4×240-9= 60-9=51

v=51+981+240=1272

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12.a-b=668

a:2b=6 r 96

a=2b×6+96

2b×6+96-b =668

12b+96-b=668

11b=668-96

11b=572|:11

b= 52

a= 52×2×6+96

=720

v= 720-52=668

720: (2×52)=720: 104=6r 96