问题
解答题
计算: (1)-20+(-15)-(-14)-18; (2)(-20)×(-6)-(-48)÷8; (3)-2
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答案
(1)-20+(-15)-(-14)-18
=-20-15+14-18
=-39,
(2)(-20)×(-6)-(-48)÷8
=120+6
=126,
(3)-2
×5-21 6
×(-4)+1 6
×(-8)13 6
=-2
×(5-4+8)1 6
=-
×913 6
=-
,39 2
(4)-16÷(-2)3-(-
)×(-4)1 8
=-16÷(-8)-1 2
=2-1 2
=1
.1 2