yanahv7的部落格

標題:

中二數學(10分)

發問:

1...已知x=1/5，y=15及z= -3。求下列w的值。 (a) w = y2 - z2/xyz 2...化簡下列各式。 (a) 1-2p/5q+15p ÷ 14p-7/q+3p (b) 4mn/3m-2 - 5n (c) y/3x + y/2x - y/x 3...已知3/c = 2/a - 6/b。若c=12及a=9，求b的值。 THX~~

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w = y2 - z2/xyz w=(15)^2-(-3)^2/(1/5)(15)(-3) w=225+1 w=226 _______________ 1-2p/5q+15p ÷ 14p-7/q+3p (1-2p)/5(q+3p)*(q+3p)/7(2p-q) (1-2p)/35(2p-q) ___________________ (4mn/3m-2) - 5n 4mn-5n(3m-2)/(3m-2) 4mn-15mn+10n/(3m-2) 10n-9mn/(3m-2) _________________ y/3x + y/2x - y/x (2y+3y-6y)/6x (-y)/6x ________________ 3/c = 2/a - 6/b 3/(12)=2/(9)-6/b 1/36=-6/b 1/-216=1/b b=-216 2010-12-01 21:20:51 補充： . 2010-12-02 20:09:49 補充： Correction: 1-2p/5q+15p ÷ 14p-7/q+3p (1-2p)/5(q+3p)*(q+3p)/7(2p-1) (1-2p)/35(2p-1) -1(2p-1)/35(2p-1) -1/35

其他解答:

1...已知x=1/5，y=15及z= -3。求下列w的值。 w = y2 - z2/xyz w=152 + 9/(1/5)X15X3 w=225+1 w=226 2...化簡下列各式。 1-2p/5q+15p ÷ 14p-7/q+3p =(-)2p-1/5(q+3p) X (q+3p)/7(2p-1) =(-)1/5 X 1/7 =1/35 4mn/3m-2 - 5n =4mn-5n(3m-2)/3m-2 =4mn-15mn+10n/3m-2 =(-)11mn+10n/3m-2 y/3x + y/2x - y/x =2y+3y-6y/6x =(-)y/6x 3...已知3/c = 2/a - 6/b。若c=12及a=9，求b的值。 3/c = 2/a - 6/b 3/12 = 2/9 - 6/b 6/b = 2/9 - 1/4 6/b = 8-9/36 6/b = (-)1/36 b = (-)6/36 b = (-)1/6|||||1...已知x=1/5，y=15及z= -3。求下列w的值。 (a) w = y2 - z2/xyz w=[(15)^2-(-3)^2]/(1/5)(15)(-3) =(225-9)/-9 =-24 2...化簡下列各式。 (a) 1-2p/5q+15p ÷ 14p-7/q+3p 1-2p/5q+15p ÷ 14p-7/q+3p =1-2p/5q+15p x q+3p/14p-7 =-(2p-1)/5(q+3p) x (q+3p)/7(2p-1) =-1/5 x1/7 =-1/35 (b) 4mn/3m-2 - 5n 4mn/3m-2 - 5n =4mn/3m-2 - 5n(3m-2)/(3m-2) =(4mn-5n(3m-2))/(3m-2) =(10n-11mn)/(3m-2) =n(10-11m)/(3m-2) (c) y/3x + y/2x - y/x y/3x + y/2x - y/x = 2y/6x + 3y/6x - 6y/6x =(2y+3y-6y)/6x =-y/6x 3...已知3/c = 2/a - 6/b。若c=12及a=9，求b的值。 3/c = 2/a - 6/b 3/12=2/9-6/b 1/36=-6/b b=(-6)(36)=-21663D0B758E2D502CC