[(42+20220)+17.20−(125−53)]−115:112[(42+20220)+17.20−(125−53)]−115:112
=[(42+20220)+17.20−(125−53)]−113=[(42+20220)+17.20−(125−53)]−113
=[(16+1)+340−0]−1331=[(16+1)+340−0]−1331
=17+340−0−1331=−974
Đúng 2
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