(1)-7+(+2)(2)0-(-5)(3)(-49)-(+91)-(-5)+(-9)(4)-7+13-6+20(5)(-112)-114+(-212)-(-334)-(-114)(6)(-5)×(-415)(7)37÷(-217)(8)(-5)×(-7)×2×(-6)(9)(-78)×15×(-117)(10)1915-数学
题文
(1)-7+(+2) (2)0-(-5) (3)(-49)-(+91)-(-5)+(-9) (4)-7+13-6+20 (5)(-1
(6)(-5)×(-4
(7)
(8)(-5)×(-7)×2×(-6) (9)(-
(10)19
(11)(-0.125)×0.5×(-100)×8 (12)3×(-2
(13)-22×(-
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答案
(1)-7+(+2)=-5; (2)0-(-5)=5; (3)(-49)-(+91)-(-5)+(-9) =-49-91+5-9 =-149+5 =-144; (4)-7+13-6+20 =-13+33 =20; (5)(-1
=(-1
=-4+3
=-
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