[题目]化简下列各数的符号:-|||-(1) -(-dfrac (2)(5))= __ --|||-(2) -(-2.5)= __ ---|||-(3) -(+6)= __ _;-|||-(4) -(-0)= __ --

[题目]化简:-|||-(4(a)^2b-3ab)+(-5(a)^2b+2ab)

[题目]计算:-|||-(1) ((-1))^100times 5+((-2))^4div 4 ;-|||-(2) ((-3))^3-3times ((-dfr

[题目]设 =dfrac (1)({log )_(2)11}+dfrac (1)({log )_(3)11}+dfrac (1)({log )_(4)11}+d

[题目]-|||-椭圆 dfrac ({x)^2}(3)+dfrac ({y)^2}(4)=1 的离心率是 __

[题目]-|||-求曲线 ^dfrac (2{3)}+(y)^dfrac (2{3)}=(a)^dfrac (2{3)} 在点 (dfrac (sqrt {2)

[题目]-|||-计算:-|||-dfrac (1)(1times 2)+dfrac (2)(2times 4)+dfrac (3)(4times 7)+dfr

[题目]写出下面数列的一个通项公式,使它的前-|||-4项分别是下列各数:-|||-(1)3,6,9,12,···;-|||-(2) -5,10 -15,20,

【题目】-|||-计算下列行列式的值:-|||-1 2 .-1 2-|||-3 0 1 5-|||-1 -2 0 3-|||--2 -4 1 6

[题目]求椭圆 dfrac ({x)^2}(4)+dfrac ({y)^2}(9)=1 在点 (1,dfrac (3sqrt {3)}(2)) 处的法线方-||

[试题]化简下列各式：（1）5x4+3x2y-10-3x2+x-1;（2）p²+3pq+6-8p²+pq ;（3）（7y-3z）-（8y-5z）;（4）-(a5-6b)-(-7+3b)（5）2（2a²+9b）+3（-5a²-4b）；（6）-3（2x²-xy）+4（x²+xy-6）.