初二的乘法公式计算吧 恩1.(3a-3b)(3a+4b) 2.(2x²+3x)(2x²-3x)3.(4x-1)(-4x-1)4.(x-y+1)(x+y+1) 5.(3x-2y)² 6.(4x²+3y²)² 7.(a-b-2)²8.99*101*10001 9.9999² 10.(x-1)(x-2)(x-3)(x-4)
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![初二的乘法公式计算吧 恩1.(3a-3b)(3a+4b) 2.(2x²+3x)(2x²-3x)3.(4x-1)(-4x-1)4.(x-y+1)(x+y+1) 5.(3x-2y)² 6.(4x²+3y²)² 7.(a-b-2)²8.99*101*10001 9.9999² 10.(x-1)(x-2)(x-3)(x-4)](/uploads/image/z/4338249-33-9.jpg?t=%E5%88%9D%E4%BA%8C%E7%9A%84%E4%B9%98%E6%B3%95%E5%85%AC%E5%BC%8F%E8%AE%A1%E7%AE%97%E5%90%A7+%E6%81%A91.%283a-3b%29%283a%2B4b%29+2.%282x%26%23178%3B%2B3x%29%282x%26%23178%3B-3x%293.%284x-1%29%28-4x-1%294.%28x-y%2B1%29%28x%2By%2B1%29+5.%283x-2y%29%26%23178%3B+6.%284x%26%23178%3B%2B3y%26%23178%3B%29%26%23178%3B+7.%28a-b-2%29%26%23178%3B8.99%2A101%2A10001+9.9999%26%23178%3B+10.%28x-1%29%28x-2%29%28x-3%29%28x-4%29)
初二的乘法公式计算吧 恩1.(3a-3b)(3a+4b) 2.(2x²+3x)(2x²-3x)3.(4x-1)(-4x-1)4.(x-y+1)(x+y+1) 5.(3x-2y)² 6.(4x²+3y²)² 7.(a-b-2)²8.99*101*10001 9.9999² 10.(x-1)(x-2)(x-3)(x-4)
初二的乘法公式计算吧 恩
1.(3a-3b)(3a+4b)
2.(2x²+3x)(2x²-3x)
3.(4x-1)(-4x-1)
4.(x-y+1)(x+y+1)
5.(3x-2y)²
6.(4x²+3y²)²
7.(a-b-2)²
8.99*101*10001
9.9999²
10.(x-1)(x-2)(x-3)(x-4)
初二的乘法公式计算吧 恩1.(3a-3b)(3a+4b) 2.(2x²+3x)(2x²-3x)3.(4x-1)(-4x-1)4.(x-y+1)(x+y+1) 5.(3x-2y)² 6.(4x²+3y²)² 7.(a-b-2)²8.99*101*10001 9.9999² 10.(x-1)(x-2)(x-3)(x-4)
1、原式=9a²+12ab-9ab-12b²=9a²+3ab-12b²
2、原式=4x⁴-6x³+6x³-9x²=4x⁴-9x²
3、原式=-(4x-1)(4x+1)=-(16x²-1)=1-16x²
4、原式=(x+1)²-y²=x²-y²+2x+1
5、原式=9x²-12xy+4y²
6、原式=16x⁴+12x²y²+9y⁴
7、原式=(a-b)²-4(a-b)+4=a²-2ab+b²-4a+4b+4=a²+b²-2ab-4a+4b+4
8、原式=(100-1)(100+1)(10000+1)=(10000-1)(10000+1)=100000000-1=99999999
9、原式=(10000-1)²=100000000-20000+1=99 980 001
10、原式=(x²-5x+4)(x²-5x+6)=(x²-5x)²+10(x²-5x)+24=x⁴-10x³+25x²+10x²-50x+24=x⁴-10x³+35x²-50x+24
(3a-3b)(3a+4b) =9a²-9ab+12ab-12b²=9a²+3ab-12b² .(2x²+3x)(2x²-3x)=4x^4-9x² 3.(4x-1)(-4x-1)=-16x²+1 全部展开 (3a-3b)(3a+4b) =9a²-9ab+12ab-12b²=9a²+3ab-12b² .(2x²+3x)(2x²-3x)=4x^4-9x² 3.(4x-1)(-4x-1)=-16x²+1 4.(x-y+1)(x+y+1) =(x+1)²-y²=x²+2x+1-y² 5.(3x-2y)²=9x²-12xy+4y² 7.(a-b-2)²=(a-b)²-4(a-b)+4=a²-2ab+b²-4a+4b+4 8. 99*101*10001 =(100-1)(100+1)×10001=(10000-1)×(10000+1)=100000000-1=99999999 9. 9999² =(10000-1)²=100000000-20000+1=99980001 10.(x-1)(x-2)(x-3)(x-4)=(x²-5x+4)(x²-5x+6)=(x²-5x)²+10(x²-5x)+24=x^4-10x³+ 35x²-50x+24 收起
6.(4x²+3y²)² =16x^4+24x²y²+9y^4