计算下列各小题(1)5-(-6)-(+3)(2) (-81)÷2 1 4 × 4 9 ÷(-8) (3) ( 7
计算下列各小题(1)5-(-6)-(+3)(2)(-81)÷214×49÷(-8)(3)(79-56+34)÷(-136)(4)-42÷(-2)-(-18)÷(-14)2...
计算下列各小题(1)5-(-6)-(+3)(2) (-81)÷2 1 4 × 4 9 ÷(-8) (3) ( 7 9 - 5 6 + 3 4 )÷(- 1 36 ) (4)-4 2 ÷(-2)- (- 1 8 )÷ (- 1 4 ) 2 (5)1-2+3-4+5-6+…+2019-2020.
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(1)5-(-6)-(+3) =5+6-3 =11-3 =8; (2) (-81)÷2
=(-81)×
=2; (3) (
= (
=
=(-28)-(-30)+(-27) =(-56)+30 =-26; (4)-4 2 ÷(-2)- (-
=-16÷(-2)-(-
=8-(-2) =8+2 =10; (5)1-2+3-4+5-6+…+2019-2020 =(1-2)+(3-4)+(5-6)+…+ =(-1)+(-1)+…+(-1)(1010个-1相加) =-1010. |
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