(5a+6b-7c)^2-(5a-6b+7c)^2
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(5a+6b-7c)^2-(5a-6b+7c)^2
(5a+6b-7c)^2-(5a-6b+7c)^2
(5a+6b-7c)^2-(5a-6b+7c)^2
(5a+6b-7c)^2-(5a-6b+7c)^2
=[(5a+6b-7c)-(5a-6b+7c)]×[(5a+6b-7c)+(5a-6b+7c)]
=(12b-14c)×10a
=20a(6b-7c)
(5a+6b-7c)^2-(5a-6b+7c)^2=【(5a+6b-7c)+(5a-6b+7c)】×【(5a+6b-7c)-(5a-6b+7c)】
=10a(12b-14c)=120ab-140ac
没看懂要求什么
提取负号
(5a+6b-7c)^2+(5a+6b-7c)^2
=2(5a+6b-7c)^2
(5a+6b-7c)^2-(5a-6b+7c)^2
=[5a+(6b-7c)]^2-[5a-(6b-7c)]^2
=[5a+(6b-7c)+5a-(6b-7c)][[5a+(6b-7c)+5a-(6b-7c)]
=10a[2(6b-7c)]=120ab-140ac
初二分式的加减法2a-b-c/(a-b)(a-c)+ 2b-c-a/(b-c)(b-a)+ 2c-b-a/(c-b)(c-a)3a-6b/a+b- 5a-6b/a-b- 4a-5b/a+b+ 7a-8b/b-a注:有空格的地方是下一个分式
5a+{3b+[6c-2a-2(a-c)]}-[9a-(7b+c)]
5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
5a-{-3b+[6c-2a-(a-c)}-[9a-(7b+c)]
5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
计算:5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
化简:7(a-b-c)-5(a+b-c)+3(a-b-c)+(a+b-2)
a+6b等于c,2a-2b等于5c,求a:b;c
5c/6a^2b+7a/8b^2c-b/12a^2c
5c/6a^2b+7a/8b^2c-b/12a^2c通分计算
a:b:c=5:6:7,如果a b c都增加2,那么a:b:c=( ):( ):( )
已知a+2b/7=3b-2c/5=c-2a,则3a+b-2c/2a-5b+6c=?
已知a-b/2=b-2c/3=3c-a/4.求5a+6b-7c/4a-3b+9c
若a-b/2=b-2c/3=3c-a/4,求5a+6b-7c/4a-3b+9c
因式分解(a+b)(b+c)(c+a)+abc1.(a+b)(b+c)(c+a)+abc2.(c+a-b)(b+c-a)(a+b-c)+a(a-b+c)(a+b-c)+b(a+b-c)(-a+b+c)+c(-a+b+c)(a-b+c)3.1-12x^2y^2+48x^4y^4-64x^6y^64.m^5+m+1
计算题5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
若|a|=5,|b|=2,|c|=6,且|a+b|=-(a+b),|a+c|=a+c,求a-b-c的值
若|a|=5,|b|=2,|c|=6且|a+b|=-(a+b),|a+c|=a+c,求a-b+c的值