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2016-10-04T16:09:37+08:00
= 7 (-5.6 ÷ 2/3) + 15
= 7 (-8.4) + 15
= -58.8 + 15
= -43.8
2016-10-04T16:10:05+08:00
=7(-8·4)+15
=-58.8+15
=-43.8