(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0.4 =(ab+0.4)(ab-0.4) (3)(a+b+c) -(a-b-c) =(a+b+c+a-b-c)(a+b+c-a+b+c) =2a(2b+2c) =4a(b+c) (4)9a -(b-c) =(3a+b-c)(3a-b+c) 5
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![(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0.4 =(ab+0.4)(ab-0.4) (3)(a+b+c) -(a-b-c) =(a+b+c+a-b-c)(a+b+c-a+b+c) =2a(2b+2c) =4a(b+c) (4)9a -(b-c) =(3a+b-c)(3a-b+c) 5](/uploads/image/z/5874984-0-4.jpg?t=%EF%BC%881%291-100x+%3D%EF%BC%881%2B10x%29%281-10x%29+%EF%BC%882%EF%BC%89-0.16%2Ba+b+%3D%28ab%29+-0%EF%BC%881%291-100x++%3D%EF%BC%881%2B10x%29%281-10x%29+%EF%BC%882%EF%BC%89-0.16%2Ba+b+%3D%28ab%29+-0.4+%3D%28ab%2B0.4%29%28ab-0.4%29+%EF%BC%883%EF%BC%89%EF%BC%88a%2Bb%2Bc%29+-%EF%BC%88a-b-c%29++%3D%28a%2Bb%2Bc%2Ba-b-c%29%28a%2Bb%2Bc-a%2Bb%2Bc%EF%BC%89+%3D2a%282b%2B2c%29+%3D4a%28b%2Bc%29+%EF%BC%884%EF%BC%899a+-%EF%BC%88b-c%29++%3D%283a%2Bb-c%29%283a-b%2Bc%29+5)
(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0.4 =(ab+0.4)(ab-0.4) (3)(a+b+c) -(a-b-c) =(a+b+c+a-b-c)(a+b+c-a+b+c) =2a(2b+2c) =4a(b+c) (4)9a -(b-c) =(3a+b-c)(3a-b+c) 5
(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0
(1)1-100x =(1+10x)(1-10x)
(2)-0.16+a b =(ab) -0.4 =(ab+0.4)(ab-0.4)
(3)(a+b+c) -(a-b-c)
=(a+b+c+a-b-c)(a+b+c-a+b+c)
=2a(2b+2c)
=4a(b+c)
(4)9a -(b-c)
=(3a+b-c)(3a-b+c)
5)100p -4q的6次方
=(10p) -(2q )
=(10p+2q )(10p-2q )
=4(5p+q )(5p-q )
(6)4(2x+y) -9(x-2y)
=[2(2x+y)] -[3(x-2y)]
=[2(2x+y)+3(x-2y]][2(2x+y)-3(x-2y]
=[4x+2y+3x-6y][4x+2y-3x+6y]
=(7x-4y)(x+8y)
(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0(1)1-100x =(1+10x)(1-10x) (2)-0.16+a b =(ab) -0.4 =(ab+0.4)(ab-0.4) (3)(a+b+c) -(a-b-c) =(a+b+c+a-b-c)(a+b+c-a+b+c) =2a(2b+2c) =4a(b+c) (4)9a -(b-c) =(3a+b-c)(3a-b+c) 5
好好想挖..(100-X)*1/3-1/10X=16
100/3-x/3-x/10=16
x/3+x/10=100/3-16
13x/30=52/3
x=40
看绘图仪黄花岗