Bài 4: Tính
1) 23.(20+13)-23.13
3) -98.(1-246)-246.98
5) 4. (1930+2019)+4.(-2019)
7) 37.42+58.37-(88.21+12.21)
9) 13.23-13.17-(13.23+13.17)
11)-75.57+75.34-(57.34-57.75)
13) (-12).7-72.(-12)-(25.55-25.43)
15) (-37). 55-23.(-37)-(55.23-37.55)
2) -67.(1-301)-300.67
4) (−3).(−17)+3.(120–1 ...
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