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標題:
晤識做公式...
1. 圖片參考：http://imgcld.yimg.com/8/n/HA07688171/o/701107260016913873432964.jpg
最佳解答:
1a. (12x^4)(y^7)/(4y^7) =(12x^4)/4 =3x^4 1b (20x^6)(y^5)/(5x^3)(y^2) =4(x^3)(y^3) 1c. (45y^5)(7x)/(21)(5y) =3xy^4 1d (28x^3)/(25y)+(14x^4)/15y^3 =[420(x^3)(y^3)+350(x^4)(y)]/375y^4 =y(420x^3(y^2)+350x^4)/375y^4 =5(84x^3(y^2)+70x^4)/375y^3 =(84x^3(y^2)+70x^4)/75y^3 2e (am+bm)/(a+b) =m(a+b)/(a+b) =m 2f (4x+12y)/(3x+9y) =4(x+3y)/3(x+3y) =4/3 2g (2x+3x)/5 =5x/5 =x 2h 5x/4+3x/6 =5x/4+x/2 =5x/4+2x/4 =7x/4 3i (x-3)/4+(3x11)/4 =(2x+8)/4 =(x+4)/2 3j (5x+y)/(x+y)+(x-y)/(x+y) =6x/(x+y) 4a A=x+y-10 x=7 y=9 A=7+9-10 A=6 4b B=(x^2)+3x x=5 B=(5^2)+3(5) B=40 5c C=8(n-2)+3 n=6 C=8(6-2)+3 C=35 5d D=(h-2)/(10-h) h=6 D=(6-2)/(10-6) D=1 5e E=兀r^2 r=8 兀=3 E=3*8^2 E=192
其他解答:
好難明白 -.-"|||||1)(a) [12(x^4)(y^7)]/[4(y^2)] =3(x^4)[y^(7-2)] =3(x^4)(y^5) 1)(b) [20(x^6)(y^5)]/[5(x^3)(y^2)] =4[x^(6-3)][y^(5-2)] =4(x^3)(y^3) 1)(c) {[45(y^2)]/21}{(7x)/[5(y^2)]} =(9/21)(7x) =3x 1)(d) {[28(x^3)]/(25y)} / {[14(x^4)]/[15(y^3)]} = {[28(x^3)]/(25y)}{[15(y^3)]/[14(x^4)]} =(28/25){[15(y^2)]/14x} =(2/5){[3(y^2)]/x} =[6(y^2)]/(5x) 2)(e) (am+bm)/(a+b) = [m(a+b)]/(a+b) = m 2)(f) (4x+12y)/(3x+9y) =[4(x+3y)]/[3(x+3y)] =4/3 2)(g) [(2x)/5]+[(3x)/5] =(5x)/5 =x 2)(h) [(5x)/4]+[(3x)/6] =[(5x)/4]+[(2x)/4] (3/6 = 2/4) =(7x)/4 3)(i) [(x-3)/4]+[(3x+11)/4] =(x+3x-3+11)/4 =(4x+8)/4 =[4(x+2)]/4 =x+2 3)(j) [(3x+5y)/(x+y)]+[(x-y)/(x+y)] =(3x+x+5y-y)/(x+y) =(4x+4y)/(x+y) =[4(x+y)]/(x+y) =4 4(a) A=x+y-10 Sub x=7, y=9 A=7+9-10 A=6 4(b) B=(x^2)+3x Sub x=5 B=(5^2)+3(5) B=40 5(c) C=8(n-2)+3 Sub n=6 C=8(6-2)+3 C=35 5(d) D=(h-2)/(10-h) Sub h=6 D=(6-2)/(10-6) D=1 5)(e) E=(pi)(r^2) Sub r=8, pi=3 E=(3)(8^2) E=192 2011-07-27 09:11:13 補充： 你寫出黎未睇得明lo... 再唔係你俾你個e-mail我...我sd個word(2007)檔俾你喇.. ;)31C9A75CB3B14398
晤識做公式...
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發問:1. 圖片參考：http://imgcld.yimg.com/8/n/HA07688171/o/701107260016913873432964.jpg
最佳解答:
1a. (12x^4)(y^7)/(4y^7) =(12x^4)/4 =3x^4 1b (20x^6)(y^5)/(5x^3)(y^2) =4(x^3)(y^3) 1c. (45y^5)(7x)/(21)(5y) =3xy^4 1d (28x^3)/(25y)+(14x^4)/15y^3 =[420(x^3)(y^3)+350(x^4)(y)]/375y^4 =y(420x^3(y^2)+350x^4)/375y^4 =5(84x^3(y^2)+70x^4)/375y^3 =(84x^3(y^2)+70x^4)/75y^3 2e (am+bm)/(a+b) =m(a+b)/(a+b) =m 2f (4x+12y)/(3x+9y) =4(x+3y)/3(x+3y) =4/3 2g (2x+3x)/5 =5x/5 =x 2h 5x/4+3x/6 =5x/4+x/2 =5x/4+2x/4 =7x/4 3i (x-3)/4+(3x11)/4 =(2x+8)/4 =(x+4)/2 3j (5x+y)/(x+y)+(x-y)/(x+y) =6x/(x+y) 4a A=x+y-10 x=7 y=9 A=7+9-10 A=6 4b B=(x^2)+3x x=5 B=(5^2)+3(5) B=40 5c C=8(n-2)+3 n=6 C=8(6-2)+3 C=35 5d D=(h-2)/(10-h) h=6 D=(6-2)/(10-6) D=1 5e E=兀r^2 r=8 兀=3 E=3*8^2 E=192
其他解答:
好難明白 -.-"|||||1)(a) [12(x^4)(y^7)]/[4(y^2)] =3(x^4)[y^(7-2)] =3(x^4)(y^5) 1)(b) [20(x^6)(y^5)]/[5(x^3)(y^2)] =4[x^(6-3)][y^(5-2)] =4(x^3)(y^3) 1)(c) {[45(y^2)]/21}{(7x)/[5(y^2)]} =(9/21)(7x) =3x 1)(d) {[28(x^3)]/(25y)} / {[14(x^4)]/[15(y^3)]} = {[28(x^3)]/(25y)}{[15(y^3)]/[14(x^4)]} =(28/25){[15(y^2)]/14x} =(2/5){[3(y^2)]/x} =[6(y^2)]/(5x) 2)(e) (am+bm)/(a+b) = [m(a+b)]/(a+b) = m 2)(f) (4x+12y)/(3x+9y) =[4(x+3y)]/[3(x+3y)] =4/3 2)(g) [(2x)/5]+[(3x)/5] =(5x)/5 =x 2)(h) [(5x)/4]+[(3x)/6] =[(5x)/4]+[(2x)/4] (3/6 = 2/4) =(7x)/4 3)(i) [(x-3)/4]+[(3x+11)/4] =(x+3x-3+11)/4 =(4x+8)/4 =[4(x+2)]/4 =x+2 3)(j) [(3x+5y)/(x+y)]+[(x-y)/(x+y)] =(3x+x+5y-y)/(x+y) =(4x+4y)/(x+y) =[4(x+y)]/(x+y) =4 4(a) A=x+y-10 Sub x=7, y=9 A=7+9-10 A=6 4(b) B=(x^2)+3x Sub x=5 B=(5^2)+3(5) B=40 5(c) C=8(n-2)+3 Sub n=6 C=8(6-2)+3 C=35 5(d) D=(h-2)/(10-h) Sub h=6 D=(6-2)/(10-6) D=1 5)(e) E=(pi)(r^2) Sub r=8, pi=3 E=(3)(8^2) E=192 2011-07-27 09:11:13 補充： 你寫出黎未睇得明lo... 再唔係你俾你個e-mail我...我sd個word(2007)檔俾你喇.. ;)31C9A75CB3B14398
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