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9+3a=24-2a repede pls

6(x=7)=54

5(a:4-10)=20

Răspuns :

Icecon2005
9+3a=24-2a ⇒3a+2a=24-9⇒5a=15=5a⇒a=15:5    ⇒a = 3

6(x+7)=54⇒x+7=54:6⇒x+7=9⇒x=9-7                      ⇒x=2

5(a:4-10)=20 ⇒5[(a-10×4)/4]=20⇒5a-200=20×4
⇒5a=80+200⇒5a=280⇒a=280:5⇒                        ⇒ a = 56
Iamale47
a). 9+3a=24-2a <=> 5a=24-9 <=> 5a=15 <=> a=15:5 <=> a=3. b).6(x+7)=54 <=> x+7=54:6 <=> x+7=9 <=> x=9-7 <=> x=2. c). 5(a:4-10)=20 <=> a:4-10=20:5 <=> a:4-10=4 <=> a:4=10+4 <=> a:4=14 <=> a=14×4 <=> a=56.

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