初一数学题!急！在线等！要过程！急！
\u521d\u4e00\u6570\u5b66\u9898 \u6025~~~~ \u8981\u8fc7\u7a0b\u554a1. 4(b-a)(a+b)-(2a-3b)(3a-2b) =4(ba+b^2-a^2-ab)-(6a^2-4ab-9ab+6b^2)
=4b^2-4a^2-6a^2+13ab-6b^2=13ab-10a^2-2b^2
2. (a-b+c)(a-b-c)=(a-b)(a-b)-c^2
=a^2-2ab+b^2-c^2
3. 2a\u7684\u4e94\u6b21\u65b9\u4e58\uff08-a²\uff09³ \u4e58\uff08-7a\uff09=(32a^5)*(-a^6)*(-7a)
=32*(-1)*(-7)*a^(5+6+1)
=224a^12
4. \u7b80\u4fbf\u8ba1\u7b97:2009²-4018*2008+2008²=2009²-2*2009*2008+2008²
=(2009-2008)^2
=1
\u53e6\u5916\uff1aab\u5c31\u662fa\u4e58\u4ee5b\u7684\u610f\u601d
a^2\u662fa\u7684\u5e73\u65b9\u7684\u610f\u601d\uff0c\u540c\u7406\uff0ca^12\u5c31\u662fa\u768412\u6b21\u65b9\u7684\u610f\u601d
\u6839\u636e\u9898\u610f,a,b,c\u4e09\u8fb9\u5fc5\u987b\u6ee1\u8db3\u4e0b\u5217\u6761\u4ef6.
ac, \u4e14 a+b+c=24
\u56e0\u4e3a 24=a+b+c>c+c=2c, \u6240\u4ee5c=13
\u56e0\u4e3a 24=a+b+c>a+a+a=3a, \u6240\u4ee5a=7, \u56e0\u4e3aa=7
\u6240\u4ee5\u5f52\u7eb3\u4e0a\u8ff0\u7ed3\u8bba\u5f97\u5230 a<=6<7<=b<c<=11
\u4f60\u53ef\u4ee5\u6839\u636e\u8fd9\u4e2a\u7ed3\u8bba\u5199\u51fa\u6ee1\u8db3\u9898\u610f\u7684a.b.c
³√64=4
4的平方根是±2
立方根等于它本身的数是0和±1
(-2)^6的平方根是±8,立方根是4
³√(-8)=-2
³√216=6
³√(-27/64)=-3/4
2或-2
7. -1，0，1
8. 8或-8 ，4
9. -2 （2）6.（3）-3/4
（1）因为(-2)³ = -8 所以-8的立方根是-2
(2)因为6³ = 216 所以 216的立方根是6
(3)因为(-3/4)³ = -27/64 所以 -27/64 的立方根是 -3/4
虽然作为年级比你高的学姐我很想告诉你答案但无奈这图我看不太清楚你要是不嫌麻烦可以用文字打出来。
-2
6
-3/4
绛旓細2,27(x+1)3+64=0 27(x+1)3=-64 (x+1)3=-27鍒嗕箣64 x+1=-3鍒嗕箣4 鈭磝=-3鍒嗕箣7
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绛旓細鎵浠:z=4:3=12:9---(1)灏唞=3/4x甯﹀叆2寮忕殑鍒7/4x-3y=0 鎵浠:y=12:7---(2)鐢(1)(2)寰楋細x:y:z=12:7:9 (2)鍙垎鍒:x=12m,y=7m,z=9m锛堟湁寰堝绉嶈娉曪級鍒欏師寮=(24m+7m-9m)/9m=22:9
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绛旓細17銆佽В锛(1)鍘熷紡=3-(1/4)脳4-9 =3-1-9 =-7 (2)鍘熷紡=1.732-2.646+3.142 =4.874-2.646 =2.228 鈮2.23 婊℃剰鑰佸笀鐨勫洖绛斿悧锛屼翰锛熻璁板緱閲囩撼鍝
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