Răspuns:
4×(5+7+8)
=4×(12+8)
=4×20
=80
63+61×15-12
=63+915-12
=978-12
=966
347-27:3+8×6-130
=347-9+48-130
=338+48-130
=386-130
=256
65×8-21:3×7+65
=520-7×7+65
=520-49+65
=471+65
=536
35:5×36+87×10×6-2549
=7×36+870×6-2549
=252+5220-2549
=5472-2549
=2923