计算:(1)(-12)-(+8)+(-6)-(-5)(2)(-2)×(-53)-|-23|-5÷6-(?13)(3)-(a-b)-3(b-2
计算:(1)(-12)-(+8)+(-6)-(-5)(2)(-2)×(-53)-|-23|-5÷6-(?13)(3)-(a-b)-3(b-2a)(4)14(-4x2+2x...
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.
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推荐于2016-11-27
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(1)(-12)-(+8)+(-6)-(-5)
=-12-8-6+5
=-26+5
=-21;
(2)(-2)×(-
)-|-2
3|-5÷6-(
?)
=3
-8-
+
=2
-8
=-5
;
(3)-(a-b)-3(b-2a)
=-a+b-3b+6a
=5a-2b;
(4)
(-4x
2+2x-8)-(
x-1)
=-x
2+
x-2-
x+1
=-x
2-1;
(5)
(?)2÷
(?)4×(-1)
8-(1
+2
-3
)×24
=
÷
×1-1
×24-2
×24+3
×24
=1-33-56+90
=91-89
=2.
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