计算与化简:(1)(-4)-(+1)-(-5)+(-9)(2)12×(23?34+56)(3)-3×5+20÷(-4)(4)x+(5x+2y
计算与化简:(1)(-4)-(+1)-(-5)+(-9)(2)12×(23?34+56)(3)-3×5+20÷(-4)(4)x+(5x+2y)-(x-2y)...
计算与化简:(1)(-4)-(+1)-(-5)+(-9)(2)12×(23?34+56)(3)-3×5+20÷(-4)(4)x+(5x+2y)-(x-2y)
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