分一步一步来.化简:①(x+30)²-(x-1)(x-2);②4x(x+y)-(2x+y)×(2x-y);计算:a+3a(a-1∕3);化简③(x+2)²-(x+1)(x-1);④(a+1)×(a-1)+a(1-a).我承认我很笨,这些忘了怎么解了,
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![分一步一步来.化简:①(x+30)²-(x-1)(x-2);②4x(x+y)-(2x+y)×(2x-y);计算:a+3a(a-1∕3);化简③(x+2)²-(x+1)(x-1);④(a+1)×(a-1)+a(1-a).我承认我很笨,这些忘了怎么解了,](/uploads/image/z/2682809-17-9.jpg?t=%E5%88%86%E4%B8%80%E6%AD%A5%E4%B8%80%E6%AD%A5%E6%9D%A5.%E5%8C%96%E7%AE%80%EF%BC%9A%E2%91%A0%EF%BC%88x%2B30%EF%BC%89%26%23178%3B-%EF%BC%88x-1%EF%BC%89%EF%BC%88x-2%EF%BC%89%EF%BC%9B%E2%91%A14x%EF%BC%88x%2By%EF%BC%89-%EF%BC%882x%2By%EF%BC%89%C3%97%EF%BC%882x-y%EF%BC%89%EF%BC%9B%E8%AE%A1%E7%AE%97%EF%BC%9Aa%2B3a%EF%BC%88a-1%E2%88%953%29%3B%E5%8C%96%E7%AE%80%E2%91%A2%EF%BC%88x%2B2%EF%BC%89%26%23178%3B-%EF%BC%88x%2B1%29%28x-1%29%3B%E2%91%A3%28a%2B1%EF%BC%89%C3%97%EF%BC%88a-1%EF%BC%89%2Ba%EF%BC%881-a%EF%BC%89.%E6%88%91%E6%89%BF%E8%AE%A4%E6%88%91%E5%BE%88%E7%AC%A8%2C%E8%BF%99%E4%BA%9B%E5%BF%98%E4%BA%86%E6%80%8E%E4%B9%88%E8%A7%A3%E4%BA%86%2C)
分一步一步来.化简:①(x+30)²-(x-1)(x-2);②4x(x+y)-(2x+y)×(2x-y);计算:a+3a(a-1∕3);化简③(x+2)²-(x+1)(x-1);④(a+1)×(a-1)+a(1-a).我承认我很笨,这些忘了怎么解了,
分一步一步来.化简:①(x+30)²-(x-1)(x-2);
②4x(x+y)-(2x+y)×(2x-y);计算:a+3a(a-1∕3);化简③(x+2)²-(x+1)(x
-1);④(a+1)×(a-1)+a(1-a).我承认我很笨,这些忘了怎么解了,正在复习ing.3Q
分一步一步来.化简:①(x+30)²-(x-1)(x-2);②4x(x+y)-(2x+y)×(2x-y);计算:a+3a(a-1∕3);化简③(x+2)²-(x+1)(x-1);④(a+1)×(a-1)+a(1-a).我承认我很笨,这些忘了怎么解了,
1、原式=x+30-(x*x-2*x-1*x+2)=x+30-(x平方-3x+2)=x+30-x平方+3x-2=-x平方+4x+32
2、原式=4x*x+4x*y-【(2x)平方-y平方】=4x平方+4xy-4x平方+y平方=4xy+y平方
3、原式=a+3a平方-a=3a平方
4、原式=x平方+4x+4-(x平方-1)=x平方+4x+4-x平方+1=4x+5
5、原式=a平方-1+a-a平方=-1+a
一定要采纳!打得很累啊!
1、(x+30)²-(x-1)(x-2)=x^2+60x+900-x^2+3x-2=63x+898
2、4x(x+y)-(2x+y)×(2x-y)=4x^2+4xy-4x^2+y^2=y^2+4xy;3a^2
3、(x+2)²-(x+1)(x-1)=x^2+4x+4-x^2+1=4x+5
4、(a+1)×(a-1)+a(1-a)=a^2-1+a-a^2=a-1