已知A=(a+2)(a-2),B=2(6-1/2a²),C=(a-1)²,化简3A+2B-C
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/28 17:23:39
已知A=(a+2)(a-2),B=2(6-1/2a²),C=(a-1)²,化简3A+2B-C
![已知A=(a+2)(a-2),B=2(6-1/2a²),C=(a-1)²,化简3A+2B-C](/uploads/image/z/6461746-34-6.jpg?t=%E5%B7%B2%E7%9F%A5A%3D%28a%2B2%29%28a-2%29%2CB%3D2%286-1%2F2a%26%23178%3B%29%2CC%3D%28a-1%29%26%23178%3B%2C%E5%8C%96%E7%AE%803A%2B2B-C)
解
3A+2B-C
=3(a+2)(a-2)+4(6-1/2a²)-(a-1)²
=3(a²-4)+24-2a²-(a²-2a+1)
=(3a²-2a²-a²)+2a+(-12+24-1)
=2a+11
3A+2B-C
=3(a+2)(a-2)+4(6-1/2a²)-(a-1)²
=3(a²-4)+24-2a²-(a²-2a+1)
=(3a²-2a²-a²)+2a+(-12+24-1)
=2a+11
已知A=(a+2)(a-2),B=2(6-1/2a²),C=(a-1)²,化简3A+2B-C
已知(a-1)²+(2a-b)⁴+|a+3c|=0,求a-(b-2c)的值.
已知a≥b≥c,a+b+c=1,abc>0,且a³-2a²+a-2≥0,求|a|+|b|+|c
已知A=3a-6a+1,B=-2a^2+3,C=4a,计算(B+C)-{A-(B-C)}.
已知a、b、c满足a²+2b=7,b-2c=1,c²-6c=17,求a+b+c的值
已知A=-7a²-5a-1,B=2a²-3a+1,且2A-3B+C=0,求C
已知A=-7a²-5a-1,b=2a²-3a+1,且2A-3B+c=0求C
已知a,b,c,满足绝对值a-2+√a-2b+c+c²-c+1/4=0求±√a+b+c
行列式证明|b+c c+a a+b| | a b c||a+b b+c c+a| = 2 |c a b||c+a a+b
已知a,b,c是正数,求证a^2a*b^2b*c^2c>=a^(b+c)*b^(c+a)*c^(a+b)
已知有理数a,b,c满足|a-1|+|a+b|+|a+b+c-2|=0,则代数式(-3ab)(-a^2c)*6ab^2的
已知向量a,b,c满足|a|=2 a/|a|+b/|b|=(a+b)/|a+b|,(a-c)*(b-c)=0,则|c|的