计算下列各式:(1)(-13)+(-8)(2)-27-(-17)(3)(-56)×(-310)(4)-1+(-2)-(-3)-5(5)-24×(-12+34-13)(6)|-212|-(-2.5)+1-|1-212|(7)(-3)×56×(-45)×(-14)(8)16+120+112+130(巧算)(-数学
题文
计算下列各式: (1)(-13)+(-8) (2)-27-(-17) (3)(-
(4)-1+(-2)-(-3)-5 (5)-24×(-
(6)|-2
(7)(-3)×
(8)
(9)-7×(-
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答案
(1)(-13)+(-8)=-21; (2)-27-(-17)=-10; (3)(-
(4)-1+(-2)-(-3)-5 =-1-2+3-5 =-8+3 =-5; (5)-24×(-
=24×
=12-18+8 =2; (6)|-2
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