(1)计算;
(2)已知,,求3x22xy+3y2的值.
八年级数学解答题简单题
(1)计算:(15x3y+10x2y﹣5xy2)÷5xy
(2)计算:(3x+y)(x+2y)﹣3x(x+2y)
(3)先化简,再求值:(x+2)(x﹣2)﹣(x+1)2,其中x=.
八年级数学解答题中等难度题查看答案及解析
(1)计算:(15x3y+10x2y﹣5xy2)÷5xy
(2)计算:(3x+y)(x+2y)﹣3x(x+2y)
(3)先化简,再求值:(x+2)(x﹣2)﹣(x+1)2,其中x=.
八年级数学解答题中等难度题查看答案及解析
计算:
(1)(x3y)2×2xy2
(2)(3x+2y)(3x﹣2y)﹣(x﹣y)(3x+4y)
八年级数学计算题中等难度题查看答案及解析
计算:
(1)(2x+3y)(x﹣y);
(2)(3x2y﹣6xy)÷6xy.
八年级数学解答题中等难度题查看答案及解析
计算:
(1)(-a•a2)(-b)2+(-2a3b2)2÷(-2a3b2)
(2)(-2x3y2-3x2y2+2xy)÷2xy
八年级数学解答题中等难度题查看答案及解析
计算:
(1)(-a•a2)(-b)2+(-2a3b2)2÷(-2a3b2)
(2)(-2x3y2-3x2y2+2xy)÷2xy
八年级数学解答题中等难度题查看答案及解析
下列计算正确的是( )
A. (xy)3=x3y B. (2xy)3=6x3y3 C. (-3x2)3=27x5 D. (a2b)n=a2nbn
八年级数学选择题简单题查看答案及解析
下列计算错误的是( )
A. -3x(2-x)=-6x+3x2
B. (2m2n-3mn2)(-mn)=-2m3n2+3m2n3
C. xy(x2y-xy2-1)=x3y2-x2y3
D. xy=xn+2y-xy2
八年级数学单选题简单题查看答案及解析
计算:(﹣2xy2)2•3x2y•(﹣x3y4)= .
八年级数学填空题中等难度题查看答案及解析
计算
(1)+(﹣1)2016﹣
(2)(a4)3•(a2)3÷(a4)2
(3)(2x2y﹣x3y2﹣xy3)÷(﹣xy)
(4)9(x+2)(x﹣2)﹣(3x﹣1)2
(5)[(x﹣2y)2+(x﹣2y)(x+2y)﹣2x(2x﹣y)]÷2x.
八年级数学计算题中等难度题查看答案及解析