Explicație pas cu pas:
a)2×a+3×b+c=
=2×a+2×b+b+c=
=2×(a+b)+9=
=2×14+9=
=28+9=
=37
b)4×a+9×b+5×c=
=4×a+4×b+5×b+5×c=
=4×(a+b)+5×(b+c)=
=4×14+5×9=
=56+45=
=101
c)a+8×b+7×c=
=a+b+7×b+7×c=
=14+7×(b+c)=
=14+7×9=
=14+63=
=77
