去括号:(1)2(1-3x) (2)-(x2-3x) (3)-3(2x2-1)

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去括号:(1)2(1-3x)(2)-(x2-3x)(3)-3(2x2-1)去括号:(1)2(1-3x)(2)-(x2-3x)(3)-3(2x2-1)去括号:(1)2(1-3x)(2)-(x2-3x)(

去括号:(1)2(1-3x) (2)-(x2-3x) (3)-3(2x2-1)
去括号:(1)2(1-3x) (2)-(x2-3x) (3)-3(2x2-1)

去括号:(1)2(1-3x) (2)-(x2-3x) (3)-3(2x2-1)
2(1-3x)
=2-6x
(2)-(x2-3x)
=-x2+3x
(3)-3(2x2-1)
=-12+4
=-8

(1)2-6x (2)-x2+3x=x (3)-12+3=-9