七下数学因式分解例如:16a^2【16a^2念做16a的2次方】1-16a^2=?m^2—9n^2=?0.25x^2—81y^2=?9a^2—b^2y^2=?(x+5)^2—4=?(a+b)^2—a^2=?49(a—b)^2—16(a+b)^2=?(a^2+b^2)^2—a^2b^2=?
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![七下数学因式分解例如:16a^2【16a^2念做16a的2次方】1-16a^2=?m^2—9n^2=?0.25x^2—81y^2=?9a^2—b^2y^2=?(x+5)^2—4=?(a+b)^2—a^2=?49(a—b)^2—16(a+b)^2=?(a^2+b^2)^2—a^2b^2=?](/uploads/image/z/1963186-34-6.jpg?t=%E4%B8%83%E4%B8%8B%E6%95%B0%E5%AD%A6%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E4%BE%8B%E5%A6%82%EF%BC%9A16a%5E2%E3%80%9016a%5E2%E5%BF%B5%E5%81%9A16a%E7%9A%842%E6%AC%A1%E6%96%B9%E3%80%911-16a%5E2%3D%3Fm%5E2%E2%80%949n%5E2%3D%3F0.25x%5E2%E2%80%9481y%5E2%3D%3F9a%5E2%E2%80%94b%5E2y%5E2%3D%3F%28x%2B5%29%5E2%E2%80%944%3D%3F%28a%2Bb%29%5E2%E2%80%94a%5E2%3D%3F49%28a%E2%80%94b%29%5E2%E2%80%9416%28a%2Bb%29%5E2%3D%3F%28a%5E2%2Bb%5E2%29%5E2%E2%80%94a%5E2b%5E2%3D%3F)
七下数学因式分解例如:16a^2【16a^2念做16a的2次方】1-16a^2=?m^2—9n^2=?0.25x^2—81y^2=?9a^2—b^2y^2=?(x+5)^2—4=?(a+b)^2—a^2=?49(a—b)^2—16(a+b)^2=?(a^2+b^2)^2—a^2b^2=?
七下数学因式分解
例如:16a^2【16a^2念做16a的2次方】
1-16a^2=?
m^2—9n^2=?
0.25x^2—81y^2=?
9a^2—b^2y^2=?
(x+5)^2—4=?
(a+b)^2—a^2=?
49(a—b)^2—16(a+b)^2=?
(a^2+b^2)^2—a^2b^2=?
七下数学因式分解例如:16a^2【16a^2念做16a的2次方】1-16a^2=?m^2—9n^2=?0.25x^2—81y^2=?9a^2—b^2y^2=?(x+5)^2—4=?(a+b)^2—a^2=?49(a—b)^2—16(a+b)^2=?(a^2+b^2)^2—a^2b^2=?
1-16a^2=1^2-(4a)^2=(1-4a)(1+4a)
m^2-9n^2=m^2-(3n)^2=(m+3n)(m-3n)
0.25x^2-81y^2=(0.5x)^2-(9y)^2=(0.5+9y)(0.5-9y)
9a^2-b^2y^2=(3a)^2-(by)^2=(3a+by)(3a-by)
(x+5)^2-4=(x+5)^2-2^2=(x+5+2)(x+5-2)=(x+7)(x+3)
(a+b)^2-a^2=(a+b-a)(a+b+a)=b(2a+b)
49(a-b)^2-16(a+b)^2=[7(a-b)]^2-[4(a+b)]^2=[7(a-b)+4(a+b)][7(a-b)-4(a+b)]=(7a-7b+4a+4b)(7a-
7b-4a-4b)=(11a-3b)(3a-11b)
(a^2+b^2)^2-a^2b^2=(a^2+b^2)^2-(2ab)^2=(a^2+b^2+2ab )(a^2+b^2-2ab)=(a+b)^2 (a-b)^2
百度百科有解释的,去看看吧
1. 1²-(4a)²=(1+4a)(1-4a)
2.m²-(3n)²=(m+3n)(m-3n)
3.(0.5x)²-(9y)²=(0.5+9y)(0.5-9y)
4.(3a)²-(by)²=(3a+by)(3a-by)
5.(x+5)²-2...
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百度百科有解释的,去看看吧
1. 1²-(4a)²=(1+4a)(1-4a)
2.m²-(3n)²=(m+3n)(m-3n)
3.(0.5x)²-(9y)²=(0.5+9y)(0.5-9y)
4.(3a)²-(by)²=(3a+by)(3a-by)
5.(x+5)²-2²=(x+5+2)(x+5-2)
6.[7(a-b)]²-[4(a+b)]²=(7a-7b+4a+4b)(7a-7b-4a-4b)=(11a-3b)(3a-11b)
7.(a²+b²)²-(ab)²=(a+b+ab )(a+b-ab)
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