Răspuns:
a) (12+18)×15 =30x15=450
12x15+18x15=180+270=450
b) 17×2+17×8=34+136=170
(2+8)x17=10x17=170
c) (22+33+44):11+20 =99:11+20=8+20=29
(22:11)+(33:11)+(44:11)+20=2+3+4+20=29
d) (222+333+444 +555):111=1554:111=14
(222:111)+(333:111)+(444:111)+(555:111)=2+3+4+5=14
e) 325×15+325×27-325×2=4875+8775-650=13 000
(15+27-2)x325=40x325=13 000
f)(2+3+4)×7+(4+5+6)×7=9x7+15x7=63+105=168
2x7+3x7+4x7+4x7+5x7+6x7=14+21+28+28+35+42=168
