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a+2×b+4×c=34 iar b+2×c=16 atunci a×b+2×a×c=?

Răspuns :

a+2×b+4×c=34
a+2(b+2×c)=34
dar
b+2×c=16
a+2×16=34
a=34-32=2

atunci a×b+2×a×c=
a×(b+2×c)= 2×16=32



a+2×b+4×c=34.....a+2×(b+2×c)=34.....a+2×16=34
a+32=34....a=34-32.....a=2

b+2×c=16

a×b+2×a×c= a×(b+2×c)=a×16=2×16=32

Dacă tu crezi că merit, astept coroana!