15.37.4+120.21+21.5.12

2 câu trả lời

Đáp án:

15.37.4+120.21+21.5.12=130740

15.37.4+120.21+21.5.12=15.4.37+21(120+5.12)=60.37+21.(120+60)=2220+21.180=2220+3780=6000.