Đáp án:
Giải thích các bước giải:
= -1500
= 810
= -515
a) `-53×15+(-15)×47`
`= -15×(53+47)`
`= -15×100`
`= -1500`
b) `43×(53 - 81)+53×(81 - 43)`
`= 43×53-43×81+53×81-53×43`
`= -43×81+53×81`
`= 81×(-43+53)`
`= 81×10`
`= 810`
c) `-224+36-(36-24+315)`
`= -224+36-36+24+315`
`= -200+315`
`= 115`
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