Question

去括号,并合并同类项：1/2(x^2-y)+1/3(x-y^2)+1/6(x^2+y^2)

Answer 1

现在baidu真的很方便.这么简单的题一定要自己动动脑子

思路是：展开括号 ---- 统一分母 ---- 合并同类项 ---- 约分化简

1/2(x^2-y)+1/3(x-y^2)+1/6(x^2+y^2)

=1/2*x^2-1/2*y+1/3*x-1/3*y^2+1/6*x^2+1/6*y^2

=3/6*x^2-3/6*y+2/6*x-2/6*y^2+1/6*x^2+1/6*y^2

=(3/6+1/6)*x^2-3/6*y+2/6*x+(-2/6+1/6)*y^2

=4/6*x^2-3/6*y+2/6*x-1/6*y^2

=2/3*x^2-1/2*y+1/3*x-1/6*y^2