计算:(1)(-12)-(+8)+(-6)-(-5)(2)(-2)×(-53)-|-23|-5÷6-(-13)(3)-(a-b)-3(b-2a)(4)14(-4x2+2x-8)-(12x-1)(5)(-14)2÷(-12)4×(-1)8-(138+213-334)×24.-数学
题文
计算: (1)(-12)-(+8)+(-6)-(-5) (2)(-2)×(-
(3)-(a-b)-3(b-2a) (4)
(5)(-
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答案
(1)(-12)-(+8)+(-6)-(-5) =-12-8-6+5 =-26+5 =-21; (2)(-2)×(-
=3
=2
=-5
(3)-(a-b)-3(b-2a) =-a+b-3b+6a =5a-2b; (4)
=-x2+
=-x2-1; (5)(-
=
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