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ex 1, 2 , 3 dau coroana

Ex 1 2 3 Dau Coroana class=

Răspuns :

1)
L₁²/L₂²=0,25
√(L₁²/L₂²)=√0,25
L₁/L₂=0,05

2.
(L₁ × l₁)/(L₂ × l₂)= 17/18
L₁/L₂=7/2
l₁/l₂=( 17/18 )/(7/2) = 17/18  × 2/7  =17/18  × 2/7  =17/63

3.a/b=11/9
b=9a/11
a+16- (b-7)=123
a-b=120
a-9a/11=120
11a-9a=1320
a=1320/2=660
b=9×660/11=540