若化简|1-x|-√(x^2-8x+16)的结果为2x-5则x的取值范围是()A,x为任意实数 B,1≤x≤4 C,x≥1 D,x≤4请详细讲解 急

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/25 09:34:56
若化简|1-x|-√(x^2-8x+16)的结果为2x-5则x的取值范围是()A,x为任意实数B,1≤x≤4C,x≥1D,x≤4请详细讲解急若化简|1-x|-√(x^2-8x+16)的结果为2x-5则

若化简|1-x|-√(x^2-8x+16)的结果为2x-5则x的取值范围是()A,x为任意实数 B,1≤x≤4 C,x≥1 D,x≤4请详细讲解 急
若化简|1-x|-√(x^2-8x+16)的结果为2x-5则x的取值范围是()A,x为任意实数 B,1≤x≤4 C,x≥1 D,x≤4
请详细讲解 急

若化简|1-x|-√(x^2-8x+16)的结果为2x-5则x的取值范围是()A,x为任意实数 B,1≤x≤4 C,x≥1 D,x≤4请详细讲解 急
解|1-x|-√(x^2-8x+16)
=|1-x|-√(x-4)²
=(x-1)-[-(x-4)]=2x-5
即1-x≤0且x-4≤0
即1≤x≤4
即选B

原式=|1-x|-|x-4|=2x-5
显然有|1-x|=x-1,|x-4|=4-x
则有x-1>=0,4-x>=0
即有1<=x<=4
选择B

B,1≤x≤4
选B

简化│X│ - 根X * 2-8X 16的查询结果2X-5
│1-X│ - √(X * 2-8X 16) - (2X-1-X)= 0
││ - √(X-4)^ 2 - (2X-5)= 0
当x> = 4时
│1-X│ - √(X-4)^ 2 - (2X-5)= X-1-+4-2×5 = 2×8 = 0
x = 4时
时,1 =

全部展开

简化│X│ - 根X * 2-8X 16的查询结果2X-5
│1-X│ - √(X * 2-8X 16) - (2X-1-X)= 0
││ - √(X-4)^ 2 - (2X-5)= 0
当x> = 4时
│1-X│ - √(X-4)^ 2 - (2X-5)= X-1-+4-2×5 = 2×8 = 0
x = 4时
时,1 = │ 1-x│ - √(X-4)^ 2 - (2X-5)= 1 + X-4-2×5 = 0
说明1 = | 1-X│ - √(X-4)^ 2 - (2×5)= 1-X +-4-2×5 = 2×2 = 0 BR /> X = 1
指示当x <1时,无解。总结:
如果简| 1-X│ - 根所述* 2-8X +16 2X-5,则X的取值范围1 <= x <= 4

收起

*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 若化简|1-x|-√x²-8x+16=2x-5,求x的取值范围. 1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做 计算(x+/1x)(x^2+1/x^2)(x^4+1/x^4)(x^8+1/x^8)(x^16+1/x^16)(x^2-1) (x+1/x)(x^2+1/x^2)(x^4+1/x^4)(x^8+1/x^8)(x^16+1/x^16)(x^2-1) (x+x^-1)(x^2+x^-2)(x^4+x^-4)(x^8+x^-8)(x^16+x^-16)(x^2-1)=? (x+1)(x^2+1)(x^4+1)(x^8+1)(x^16+1)(x-1) x=1-x/2+x/4-x/8+x/16-x/32 x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, 24道符号^表示平方1,x^+21x+202,x^-8x-203,x^+8x-204,x^-8x-335,x^-4x-326,x^-14x+337,x^+49x+488,x^-14x+489,x^-2x-4810,x^+22x-4811,x^-19x+4812,x^-16x+4813,x^+8x-4814,x^-29x+10015,x^+x-7216,x^+32x-3317,x^-21x-10018,x^+4x+319,x^-6x+520,x^+15x+2621,x^ 求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X X=1+2/X+4/X+8/X+16/X对不起,题错了X=1+X/2+X/4+X/8+X/16 化简:[√(x^2-6x+9)/x^2-x-12]*(x^3-16x)/(x^2-3x)-1/(x+3) {x>3} 7 X 4 6 1 2 X X XX 2 X X X 3 X X X 5 X X X 9 7 X 6 XX X 6 7 2 X 5 1 XX X 2 X X X 6 X XX 1 5 X 4 6 7 X X X 3 X 8 6 X X X 9X X X 1 X X X 7 XX X X 2 7 5 8 X 1第二道~X 9 X X 8 X X 1 XX 6 X X 2 X X 4 X1 X X X X X X X 59 5 X 7 3 4 X 6 16 7 X 8 X 2 X 3 4 难倒爱因斯坦的九宫格X 7 X | X 8 1 | X X X |X X X | X 4 X | 7 5 9 |X X 5 | 7 X 9 | X 1 4 |5 X X | X X 8 | 3 9 X |3 9 6 | 4 X 7 | X X 2 |X 8 7 | 9 X X | X X X |4 X X | 6 X 5 | X X X | X X 4 | X X 1 |2 X X | X X X | X X X | X 3 X | X X X |X 6 matlab解决约束非线性规划问题myfun.mfunction f=myfun(x)f=x(1)*x(13)+x(2)*x(14)+x(3)*x(15)+x(25)+1.697*(x(4)*x(16)+...x(5)*x(17)+x(6)*x(18)+x(26))+0.575*(x(7)*x(19)+x(8)*x(20)...+x(9)*x(21)+x(27))+0.723*(x(10)*x(22)+x(11)*x(23)+x(12)*x(24));