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stind ca a+b=14 si b+c=9, calculeaza


a)2×a+3×b+c


b)4×a+9×b+5×c


c)a+8×b+7×c​


Răspuns :

Explicație pas cu pas:

a) a+b=14 => 2a+2b=28

2a+2b + b+c =28+9 => 2a+3b+c=37

b) a+b=14=> 4a+4b=56

b+c=9=> 5b+5c=45

4a +4b+5b+5c=56+45 => 4a+9b+5c=101

c) b+c=9=> 7b+7c=63

a+b+7b+7c=14+63 => a+8b+7c=77

sper sa intelegi scrisul meu :))
Vezi imaginea KAREN0649