初一数学：几道因式分解的计算题~~~~ 初一 数学 计算题和分解因式
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2.(X2-1)2/(X+1)2 =(X+1)2(X-1)2/(X+1)2 =(X+1)2
3.(a2-4)(a2+4)/a-2 =(a+2)(a-2)(a2+4)/(a-2) =(a2+4)(a+2) 字母旁的是二次方。希望能帮助你。这些不难，多背背平方差公式，完全平方和公式就行了
(x²-y²-2x+1)÷(x+y-1)
=[(x-1)²-y²]÷(x+y-1)
=(x+y-1)(x-y-1)÷(x+y-1)
=x-y-1
(x^4-2x²+1）÷(x²+2x+1)
=(x²-1)²÷(x+1)²
=(x+1)²(x-1)²÷(x+1)²
=(x-1)²
(a^4-16)÷（a-2)
=(a²+4)(a²-4）÷（a-2)
=(a²+4)(a+2)(a-2)÷（a-2)
=(a²+4)(a+2)
=（x²-2x+1-y²）÷（x+y-1）
=（（x-1）²-y²）÷（x+y-1）
=(x-1-y)(x-1+y)÷（x+y-1）
=x-1-y
=（（x²）²-2x²+1））÷（x+1）²
=（x²-1）²÷（x+1）²
=（x+1）（x-1）÷（x+1）²
=x-1/x+1
=（（a²）²-（2²）²））÷（a-2）
=（a²-2²）（a²+2²））÷（a-2）
=（a+2）（a-2）（a²+4）÷（a-2）
=（a-2）（a²+4）
1原式=（x²-2x-1-y²）/（x+y+1）=(（x-1）²-y² )/(x+y-1)=(x-y-1)
2 原式=(x ²-1)²/(x+1)²=(x-1)²(x+1)²/（x-1）²=x²+2x+1
3原式=(a²-4)(a²+4)/(a-2)=(a-2)(a+2)(a²+4)/(a-2)=(a+2)(a²+4)
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绛旓細1锛墄^4-7x^2+9 =(x^2+x-3)*(x^2-x-3)2锛墄^4-14*x^2+1 =(x^2-4*x+1)*(x^2+4*x+1)3锛墄^4-47*x^2+1 =(x^2-7*x+1)*(x^2+7*x+1)4锛墄^2-y^2+2*x+6*y-8 (x-2+y)*(x+4-y)5锛塵^4+4n^4 =(m^2-2*m*n+2*n^2)*(m^2+2*m*n+2*n...
绛旓細=x^2[a^2+b^2]+y^2[b^2+a^2]=[a^2+b^2][x^2+y^2](a+b)^2-4(a^2-b^2)+4(a-b)^2 =[a+b]^2-4[a+b][a-b]+4[a-b]^2 =[(a+b)-2(a-b)]^2 =[(3b-a)]^2 鍏跺疄杩鍑犻亾棰樼洰寰堢畝鍗曪紝鐩镐俊浣犱竴瀹氭槸鍙互鍋氬緱鍑虹殑锛屽ソ濂藉姫鍔涘惂锛屼細鍙栧緱濂界殑鎴愮哗鐨勩
绛旓細.鍒嗚В鍥犲紡:(1)a鐨勪簩娆℃柟+14ab+45b鐨勪簩娆℃柟(2)a鐨勪簩娆℃柟-9ab+20b鐨勪簩娆℃柟 .鍒嗚В鍥犲紡:a鐨勫洓娆℃柟-5a鐨勪簩娆℃柟+4 .鍒嗚В鍥犲紡:2a+4+3ab+6b 17銆佲7x2y3+42x3y2鈥14x3y3 18銆亁2锛坸鈥攜锛夆3xy锛坹鈥攛锛 19銆乤4鈥2a2b2+b4 20銆 ...
绛旓細1.A=a+c,B=b 2.-(3x+y)3.35 4.(x-y)²(a²-b²)5.(5a²-2b²+2a²-5b²)(5a²-2b²-(2a²-5b²))=(7a²-7b²)(3a²+3b²)=21(a²-b²)(a²+b²)6.0.01*...
绛旓細1. (x+1)(x+3)(x+5)(x+7)+15 =[(x+1)(x+7)][(x+3)(x+5)]+15 =(x^2+8x+7)(x^2+8x+15)+15 =(x^2+8x+7)[(x^2+8x+7)+8]+15 =(x^2+8x+7)^2+8(x^2+8x+7)+15 =[(x^2+8x+7)+3][(x^2+8x+7)+5]=(x^2+8x+10)(x^2+8x+12)=(x^2+8x...
绛旓細1.锛2a+b锛(2a-3b)-8a(2a+b)=(2a+b)[(2a-3b)-8a]=(2a+b)(-6a-3b)=-3(2a+b)(2a+b)=-3(2a+b)^2 2.16(x-y)^2-9(x+y)^2 =[4(x-y)-3(x+y)][4(x-y)+3(x+y)]=(x-7y)(7x-y)3.x^4-x^3-x+1 =x^3(x-1)-(x-1)=(x-1)(x^3-1)=(x-1)...
绛旓細(x+y-z)(x-y-z)=[(x-z)+y)][(x-z)-y]=(x-z)^2-y^2 (1/4x^2-xy+y^2)/(x-2y)=(x^2-4xy+4y^2)/4(x-2y)=(x-2y)(x-2y)/4(x-2y)=(x-2y)/4 (x-1)^2=(x-1)(x+1)瑙ｏ細(x-1)^2-(x-1)(x+1)=0 (x-1)[(x-1)-(x+1)]=0 (x-1)脳(-2...
绛旓細鍘熷紡=1/12锛6x²-8x+9锛夛紙-5/6x锛=锛-5/72x锛夛紙6x²-8x+9锛
绛旓細81锛坅-b)^2-16锛坅+b)^2 =(9a-9b+4a+4b)(9a-9b-4a-4b)=(13a-5b)(5a-13b)49(a-b)^2-16(a+b)^2 =(7a-7b-4a-4b)(7a-7b+4a+4b)=(3a-11b)(11a-3b)(a^2+b^2)^2-a^2b^2 =(a^2+b^2-ab)(a^2+b*2+ab)...
