Question

calculeaza a b c din egalitatile: (a+b)x c=81;a+b=9;ax c=18
va roooog mult
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Answer 1

(a+b)xc=81;a+b=9;axc=18. 9xc=81=>c=81:9=>c=9. axc=18=>a=18:9=>a=2. a+b=9=>2+b=9=>b=9-2=>b=7. .(a+b)xc=81= (2+7)x9=9x9=81

Answer 2

9×c=81 c=81:9 c=9 a=18:9 a=2 9-2=7 b=7