分解因式(1)x²(x-y)+(y-x)(2)(x-3)(x+2)+4/25求值 (1)x/x+1 ÷ (x - x/1)其中x=根号2+ 1 (2)解不等式组①2x-3≥1②2/x-1 +2≥-x(ps:2/x-1+2≥-x是 x-1 )——+2≥-x 是这样的,2
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![分解因式(1)x²(x-y)+(y-x)(2)(x-3)(x+2)+4/25求值 (1)x/x+1 ÷ (x - x/1)其中x=根号2+ 1 (2)解不等式组①2x-3≥1②2/x-1 +2≥-x(ps:2/x-1+2≥-x是 x-1 )——+2≥-x 是这样的,2](/uploads/image/z/4002692-68-2.jpg?t=%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%EF%BC%881%EF%BC%89x%26%23178%3B%EF%BC%88x-y%EF%BC%89%2B%EF%BC%88y-x%EF%BC%89%EF%BC%882%EF%BC%89%EF%BC%88x-3%EF%BC%89%EF%BC%88x%2B2%EF%BC%89%2B4%2F25%E6%B1%82%E5%80%BC+%EF%BC%881%EF%BC%89x%2Fx%2B1+%C3%B7+%EF%BC%88x+-+x%2F1%EF%BC%89%E5%85%B6%E4%B8%ADx%3D%E6%A0%B9%E5%8F%B72%2B+1+%EF%BC%882%EF%BC%89%E8%A7%A3%E4%B8%8D%E7%AD%89%E5%BC%8F%E7%BB%84%E2%91%A02x-3%E2%89%A51%E2%91%A12%2Fx-1+%2B2%E2%89%A5-x%EF%BC%88ps%EF%BC%9A2%2Fx-1%2B2%E2%89%A5-x%E6%98%AF+x-1+%EF%BC%89%E2%80%94%E2%80%94%2B2%E2%89%A5-x+%E6%98%AF%E8%BF%99%E6%A0%B7%E7%9A%84%2C2)
分解因式(1)x²(x-y)+(y-x)(2)(x-3)(x+2)+4/25求值 (1)x/x+1 ÷ (x - x/1)其中x=根号2+ 1 (2)解不等式组①2x-3≥1②2/x-1 +2≥-x(ps:2/x-1+2≥-x是 x-1 )——+2≥-x 是这样的,2
分解因式(1)x²(x-y)+(y-x)(2)(x-3)(x+2)+4/25
求值 (1)x/x+1 ÷ (x - x/1)其中x=根号2+ 1 (2)解不等式组①2x-3≥1②2/x-1 +2≥-x
(ps:2/x-1+2≥-x是 x-1 )
——+2≥-x 是这样的,
2
分解因式(1)x²(x-y)+(y-x)(2)(x-3)(x+2)+4/25求值 (1)x/x+1 ÷ (x - x/1)其中x=根号2+ 1 (2)解不等式组①2x-3≥1②2/x-1 +2≥-x(ps:2/x-1+2≥-x是 x-1 )——+2≥-x 是这样的,2
x"( x - y ) + ( y - x )
= x"( x - y ) - ( x - y )
= ( x - y )( x" - 1 )
= ( x - y )( x - 1 )( x + 1 )
( x - 3 )( x + 2 ) + 25/4
= x" + 2x - 3x - 6 + 6 + 1/4
= x" - x + 1/4
= x" - ( 2 / 2 )x + ( 1/2 )"
= ( x - 1/2 )"
[ ( x + 1 )/x ] / ( x - 1/x )
= [ ( 1/x )( x + 1 ) ] / [ ( 1/x )( x" - 1 ) ]
= ( x + 1 ) / [ ( x + 1 )( x - 1 ) ]
= 1 / ( x - 1 )
= 1 / [ ( √2 + 1 ) - 1 ]
= 1 / ( √2 )
= √2 / 2
2x - 3 >= 1
2x >= 4
x >= 2
( x - 1 )/2 + 2 >= -x
x - 1 + 4 >= -2x
3x + 3 >= 0
3x >= -3
x >= -1
注意:
分子、分母如果写在同一行,
就应该是分子除以分母,如【 分子 / 分母 】
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11322135464
6543213