2道初一数学计算题(对于你们来说应该狠简单的吧!)
1.(a—b)4次方—(b—a)2次方2.(m2次方—4n2次方)—(m+2n)3.(x2次方—y2次方)(x+y)—(x—y)4.(x+y)m+1的次方—(x+y)m—...
1. (a—b)4次方—(b—a)2次方
2. ( m 2次方—4n 2次方)—(m+2n)
3. (x 2次方—y 2次方)(x+y)—(x—y)
4. (x+y) m+1的次方—(x+y) m—1的次方
要详细过程的。。。本人其他都还行。就老根数学过不去。所以。。。拜托啦~
就是因式分解——完全平分公式、还有两题也不咋滴会!
你们答案怎么都不一样的啊!
恩~先等老师批下来吧。。。我看的是范晓晙的和qiuyc1997的!希望正确啊。。。 展开
2. ( m 2次方—4n 2次方)—(m+2n)
3. (x 2次方—y 2次方)(x+y)—(x—y)
4. (x+y) m+1的次方—(x+y) m—1的次方
要详细过程的。。。本人其他都还行。就老根数学过不去。所以。。。拜托啦~
就是因式分解——完全平分公式、还有两题也不咋滴会!
你们答案怎么都不一样的啊!
恩~先等老师批下来吧。。。我看的是范晓晙的和qiuyc1997的!希望正确啊。。。 展开
7个回答
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lz好。是因式分解么?
(希望lz数学好起来~过程详细。希望采纳
1.(a—b)4次方—(b—a)2次方
=(a—b)4次方—(a—b)2次方
=(a—b)2次方((a—b)2次方-1)
=(a—b)2次方(a-b+1)(a-b-1)
2.( m 2次方—4n 2次方)—(m+2n)
=(m+2n)(m-2n)—(m+2n)
=(m+2n)(m-2n-1)
3.(x 2次方—y 2次方)(x+y)—(x—y)
=(x-y)(x+y)(x+y)-(x-y)
=(x-y)((x+y)平方-1)
=(x-y)(x+y-1)(x+y+1)
4. (x+y) m+1的次方—(x+y) m—1的次方
=(x+y) m—1的次方((x+y)平方-1)
=(x+y) m—1的次方(x+y-1)(x+y+1)
这些题目的关键在于
提取公因式
平方差公式
(首先请lz相信我的答案,其次如果lz怀疑答案可以通过自我理解来否定我的解释)
(希望lz数学好起来~过程详细。希望采纳
1.(a—b)4次方—(b—a)2次方
=(a—b)4次方—(a—b)2次方
=(a—b)2次方((a—b)2次方-1)
=(a—b)2次方(a-b+1)(a-b-1)
2.( m 2次方—4n 2次方)—(m+2n)
=(m+2n)(m-2n)—(m+2n)
=(m+2n)(m-2n-1)
3.(x 2次方—y 2次方)(x+y)—(x—y)
=(x-y)(x+y)(x+y)-(x-y)
=(x-y)((x+y)平方-1)
=(x-y)(x+y-1)(x+y+1)
4. (x+y) m+1的次方—(x+y) m—1的次方
=(x+y) m—1的次方((x+y)平方-1)
=(x+y) m—1的次方(x+y-1)(x+y+1)
这些题目的关键在于
提取公因式
平方差公式
(首先请lz相信我的答案,其次如果lz怀疑答案可以通过自我理解来否定我的解释)
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1. (a—b)4次方—(b—a)2次方
=(a-b)²(a-b)²-(a-b)²
=(a-b)²[(a-b)²-1²]
=(a²-2ab+b²)(a-b+1)(a-b-1)
2. ( m 2次方—4n 2次方)—(m+2n)
=[m²-(2n)²]—(m+2n)
=(m+2n)(m-2n)—(m+2n)
=(m+2n)(m-2n-1)
3. (x 2次方—y 2次方)(x+y)—(x—y)
=(x+y) (x-y) (x+y)-(x-y)
=(x+y) (x-y) (x+y)-(x-y)
=(x+y)² (x-y)-(x-y)
=(x-y)[(x+y)² -1]
=(x-y)(x+y-1)(x+y+1)
4. (x+y) m+1的次方—(x+y) m—1的次方
(x+y) m次方(x+y)-(x+y) m次方(x+y)-1次方
=(x+y) m次方[(x+y)-(x+y) -1次方]
=(a-b)²(a-b)²-(a-b)²
=(a-b)²[(a-b)²-1²]
=(a²-2ab+b²)(a-b+1)(a-b-1)
2. ( m 2次方—4n 2次方)—(m+2n)
=[m²-(2n)²]—(m+2n)
=(m+2n)(m-2n)—(m+2n)
=(m+2n)(m-2n-1)
3. (x 2次方—y 2次方)(x+y)—(x—y)
=(x+y) (x-y) (x+y)-(x-y)
=(x+y) (x-y) (x+y)-(x-y)
=(x+y)² (x-y)-(x-y)
=(x-y)[(x+y)² -1]
=(x-y)(x+y-1)(x+y+1)
4. (x+y) m+1的次方—(x+y) m—1的次方
(x+y) m次方(x+y)-(x+y) m次方(x+y)-1次方
=(x+y) m次方[(x+y)-(x+y) -1次方]
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1.(a—b)^4-(b-a)²=(b—a)^4-(b-a)²=(b-a)²[(b-a)²-1]=(b-a)²(b-a+1)(b-a-1);
2.(m²-4n²)-(m+2n)=(m+2n)(m-2n)-(m+2n)=(m+2n)(m-2n-1);
3.(x²-y²)(x+y)-(x-y)=(x+y)(x-y)(x+y)-(x-y)
=(x-y)[(x+y)²-1]=(x-y)(x+y+1)(x+y-1);
4.(x+y)^(m+1)-(x+y)^(m-1)=(x+y)^(m-1)·(x+y)²-(x+y)^(m-1)
=(x+y)^(m-1)[(x+y)²-1]=(x+y)^(m-1)(x+y+1)(x+y-1);
2.(m²-4n²)-(m+2n)=(m+2n)(m-2n)-(m+2n)=(m+2n)(m-2n-1);
3.(x²-y²)(x+y)-(x-y)=(x+y)(x-y)(x+y)-(x-y)
=(x-y)[(x+y)²-1]=(x-y)(x+y+1)(x+y-1);
4.(x+y)^(m+1)-(x+y)^(m-1)=(x+y)^(m-1)·(x+y)²-(x+y)^(m-1)
=(x+y)^(m-1)[(x+y)²-1]=(x+y)^(m-1)(x+y+1)(x+y-1);
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1.(a—b)4次方—(b—a)2次方
=(a—b)4次方—(a—b)2次方
=(a—b)2次方((a—b)2次方-1)
=(a—b)2次方(a-b+1)(a-b-1)
2.( m 2次方—4n 2次方)—(m+2n)
=(m+2n)(m-2n)—(m+2n)
=(m+2n)(m-2n-1)
3.(x 2次方—y 2次方)(x+y)—(x—y)
=(x-y)(x+y)(x+y)-(x-y)
=(x-y)((x+y)平方-1)
4. (x+y) m+1的次方—(x+y) m—1的次方
=(x+y) m—1的次方((x+y)平方-1)
=(a—b)4次方—(a—b)2次方
=(a—b)2次方((a—b)2次方-1)
=(a—b)2次方(a-b+1)(a-b-1)
2.( m 2次方—4n 2次方)—(m+2n)
=(m+2n)(m-2n)—(m+2n)
=(m+2n)(m-2n-1)
3.(x 2次方—y 2次方)(x+y)—(x—y)
=(x-y)(x+y)(x+y)-(x-y)
=(x-y)((x+y)平方-1)
4. (x+y) m+1的次方—(x+y) m—1的次方
=(x+y) m—1的次方((x+y)平方-1)
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1. (a—b)4次方—(b—a)²= (a—b){(a—b)+1}=(a—b)(a—b+1)
2. ( m 2次方—4n 2次方)—(m+2n)=(m+2n)(m-2n)—(m+2n)=(m+2n)(m-4n-1)
3. (x 2次方—y 2次方)(x+y)—(x—y)=(x+y)(x-y)(x+y)-(x-y)=(x-y)(2x+2y)
4. (x+y) m+1²—(x+y) m—1²=(x+y) m—1²((x+y)²-1)
表酱紫。lz你要相信我的答案啊~~~我伤不起啊伤不起
2. ( m 2次方—4n 2次方)—(m+2n)=(m+2n)(m-2n)—(m+2n)=(m+2n)(m-4n-1)
3. (x 2次方—y 2次方)(x+y)—(x—y)=(x+y)(x-y)(x+y)-(x-y)=(x-y)(2x+2y)
4. (x+y) m+1²—(x+y) m—1²=(x+y) m—1²((x+y)²-1)
表酱紫。lz你要相信我的答案啊~~~我伤不起啊伤不起
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1。(a—b)2次方(a-b+1)(a-b-1)
2。(m+2n)(m-2n-1)
3。(x-y)((x+y)平方-1)
4。(x+y) m—1的次方((x+y)平方-1)
2。(m+2n)(m-2n-1)
3。(x-y)((x+y)平方-1)
4。(x+y) m—1的次方((x+y)平方-1)
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