Jawabanmu

2014-09-07T09:06:50+07:00
(-23) × (-21) + 40 - 51 × 12
= 483 + 40 - 612
= 523 - 612
= -89
2014-09-07T09:15:44+07:00
(-23) X (-21) + 40 - 51 X 12
= [(-23) X (-21)] + 40 - (51 X 12)
= 483 + 40 - 612
= 523 - 612
= -89