標題:
MATHS急問*3*中三數Indices Laws 20點^^唔該呃..
發問:
有問題有ans -]* ^ =index 即係次方其實我係唔明條式點計law..唔該可唔可以解釋下?!(2^-24x3^-12)-(-1/12)^12答案係 0 仲有我想問下面句英文既分別John is 40% heavier than Ruby, and Ruby is 30% lighter than Peter.Ruby is 42 KG咁我想問哩2句既分別ar..同埋中文點解?!ans係John係58.8kg Peter係60kg仲有因式分解3(x+2)^2-12ans係3x(x+4)總共3題ar~~~~唔該你地呃...幫我諗下計左幾日架啦-_____-太蠢 顯示更多 有問題有ans -]* ^ =index 即係次方 其實我係唔明條式點計law..唔該可唔可以解釋下?! (2^-24x3^-12)-(-1/12)^12 答案係 0 仲有我想問下面句英文既分別 John is 40% heavier than Ruby, and Ruby is 30% lighter than Peter. Ruby is 42 KG 咁我想問哩2句既分別ar..同埋中文點解?! ans係John係58.8kg Peter係60kg 仲有因式分解 3(x+2)^2-12 ans係3x(x+4) 總共3題ar~~~~唔該你地呃...幫我諗下 計左幾日架啦-_____-太蠢 更新: 點解 (-1/12)12 = (1/12)12既??
最佳解答:
(2-24×3-12) - (-1/12)12 = (1/224) × (1/312) - (1/12)12 [note: (-1/12)12 = (1/12)12) = (1/412) × (1/312) - (1/12)12 = (1/1212) - (1/12)12 = 0 John is 40% heavier than Ruby, and Ruby is 30% lighter than Peter. Ruby is 42 kg John比Ruby重40% John的重量 =Ruby的重量 (1+40%) =42 kg (1+40%) = 58.8 kg Ruby比Peter輕30% Ruby的重量=Peter的重量(1-30%) Peter的重量 = Ruby的重量 / (1-30%) = 42 kg / (1 - 30%) = 42 kg / 70% = 60 kg 3(x+2)2 - 12 = 3[(x+2)2 - 4] = 3 (x+2-2) (x+2+2) = 3x(x+4) 2007-09-02 01:54:42 補充： 補充(-1/12)^12 = (1/12)^12之問：因為(-1/12) = (-1) (1/12)而(-1)^12 = 1所以(-1/12)^12 = [(-1)^12] [(1/12)^12]= (1/12)^12
其他解答:
4^ -12 x 3^ -12 - 12^ -12 =12^ -12 - 12^ -12 = 0 John = 42 / ( 1- 40%) = 70 kg Peter = 42 / ( 1 - 30%) = 60 kg 3(x+2)^2-12 =3[(x+2)^2 - 4] =3x(x-4)
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