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Urgentt !!Dau COROANA Ex 11.12.13.14 si 15

Urgentt Dau COROANA Ex 11121314 Si 15 class=

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uote la 11 si 12

11. 5*{2x plus1}=35

2x plus 1=35:5

2x plus 1=7

2x =7-1

2x =6

x=6:2

x=3

12. P=4*5=20cm

11.

5·(2x+1)=35

10x+5=35  -5

10x=30 :10

x=3

12. a.

l=5

P patratului= 4·l=4·5=20 cm

b.1 ha=10.000 m patrati

13.a+b+c+d+e supra 5=1.7

a+b+c+d+e=1.7·5=8.5

b. a+a+1=17 -1

2a= 16

a=8

a+1=9⇒ 9·8=72