化简:(1)(5ab)/(3c)×(-(12c^2)/(5ab^2))÷3c/a;(2)4/(x-1)-x+1.
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/09/30 22:37:32
化简:(1)(5ab)/(3c)×(-(12c^2)/(5ab^2))÷3c/a;(2)4/(x-1)-x+1.
(1)(5ab)/(3c)×[-(12c^2)/(5ab^2)]÷3c/a;
=-(5ab)/(3c)×(12c^2)/(5ab^2)×a/3c
=-1/(3c)×(12c^2)/b×a/3c
=-4c/b×a/3c
=-4a/(3b)
(2)4/(x-1)-x+1
=4/(x-1)-(x-1)
=4/(x-1)-(x-1)²/(x-1)
=[4-(x-1)²]/(x-1)
=[4-(x²-2x+1)]/(x-1)
=[4-x²+2x-1]/(x-1)
=(3-x²+2x)/(x-1)
=-(5ab)/(3c)×(12c^2)/(5ab^2)×a/3c
=-1/(3c)×(12c^2)/b×a/3c
=-4c/b×a/3c
=-4a/(3b)
(2)4/(x-1)-x+1
=4/(x-1)-(x-1)
=4/(x-1)-(x-1)²/(x-1)
=[4-(x-1)²]/(x-1)
=[4-(x²-2x+1)]/(x-1)
=[4-x²+2x-1]/(x-1)
=(3-x²+2x)/(x-1)
1)三角形ABC中,三边分别是a,b,c.关于x的方程3x^2+2(a+b+c)x+(ab+bc+ca)=0.
通分(1)6c/a²b与c/3ab² (2)x - y/2x+3y与xy/(x+y)²
(1).8x平方y的4次方*-(3x)/4 (2)ab平方/2c平方/-3a平方b/4c
分解因式:(1)18x^3-27x^4-3x^2 (2)x^4-18x^3+81 16a^2b^4-8ab^2c^2+c
1.A=3a^2+4ab-1/2b^2,B=5a^2-2ab,且2A-B+C=0(A不等于a,B不等于b,C不等于c),
(1)5c平方分之6ab*3b分之10c (2)x平方+4x+4分之x平方-4y平方*3x平方+6xy分之x+2
已知ab互为倒数,cd互为相反数,x=2分之1×(﹣4),求3x-(ab+c+d)x的值.
(1):5(a²b-2ab²+c)-4(2c+3a²b-ab²);
已知A(1,2),B(2,3),C(x,5),且向量AB⊥向量AC.则x=?
已知a,b互为倒数,c,d互为相反数,且|x|=3,求2x2-(ab-c-d)+|ab+3|的值.
设A(x,1),B(2x,1),C(1,2x)D(5,3x),当x为何值时,向量AB与向量CD共线且方向相同,此时A,B
化简:【1】√8ab^2c^3(a,b,c≥0) (二次根号下 8倍a b的平方 c的三次方) 【2】√3y/√2x(二