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> 计算:(1)(-3)0+(-12)-2÷|-2|(2)(2x-3y)2-(3x+y)(3x-y)(3)(x+y)(x2+y2)(x-y)(4)(m-n-3)2-数学
计算:(1)(-3)0+(-12)-2÷|-2|(2)(2x-3y)2-(3x+y)(3x-y)(3)(x+y)(x2+y2)(x-y)(4)(m-n-3)2-数学
题目简介
计算:(1)(-3)0+(-12)-2÷|-2|(2)(2x-3y)2-(3x+y)(3x-y)(3)(x+y)(x2+y2)(x-y)(4)(m-n-3)2-数学
题目详情
计算:
(1)
(-3
)
0
+(-
1
2
)
-2
÷|-2|
(2)(2x-3y)
2
-(3x+y)(3x-y)
(3)(x+y)(x
2
+y
2
)(x-y)
(4)(m-n-3)
2
题型:解答题
难度:中档
来源:不详
答案
(1)原式=1+4÷2=1+2=3;
(2)原式=4x2-12xy+9y2-(9y2-y2)=4x2-12xy+9y2-9y2+y2=-5x2-12xy+10y2;
(3)原式=(x2-y2)(x2+y2)=x4-y4;
(4)原式=[(m-n)-3]2=(m-n)2-6(m-n)+9=m2-2mn+n2-6m+6n+9.
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题目简介
计算:(1)(-3)0+(-12)-2÷|-2|(2)(2x-3y)2-(3x+y)(3x-y)(3)(x+y)(x2+y2)(x-y)(4)(m-n-3)2-数学
题目详情
(1)(-3)0+(-
(2)(2x-3y)2-(3x+y)(3x-y)
(3)(x+y)(x2+y2)(x-y)
(4)(m-n-3)2
答案
(2)原式=4x2-12xy+9y2-(9y2-y2)=4x2-12xy+9y2-9y2+y2=-5x2-12xy+10y2;
(3)原式=(x2-y2)(x2+y2)=x4-y4;
(4)原式=[(m-n)-3]2=(m-n)2-6(m-n)+9=m2-2mn+n2-6m+6n+9.