中二數學問題求幫忙(15點)－rlz87tm45t的部落格

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中二數學問題求幫忙(15點)

發問:

Algebraic Fractions and FormulaeSimplify1.(-1/2-x)-(x/2(x-2))2.Given that A=1/2(a+b)h.^a.If A=24,a=2 and b=4,find the value of h.^b.If A=40,a=3 and=8,find the value of b.3.Given that 1/f=(1/u)-(1/v).^a.If u=2 and v=3,find the value of f.^b.If f=42 and u=6,find the value of v.4.Given that... 顯示更多 Algebraic Fractions and Formulae Simplify 1.(-1/2-x)-(x/2(x-2)) 2.Given that A=1/2(a+b)h. ^a.If A=24,a=2 and b=4,find the value of h. ^b.If A=40,a=3 and=8,find the value of b. 3.Given that 1/f=(1/u)-(1/v). ^a.If u=2 and v=3,find the value of f. ^b.If f=42 and u=6,find the value of v. 4.Given that S=(a/2)-b. ^a.If a=8 and b=5,find the value of S. ^b.If S=15 and b=7,find value of a. 5.Change the subject of the following formulae to x. ^a.4mx=3(n-x) ^b.x/(x-y)=z 有睇吾明嘅地方可以問我知道答案的plz help!!!! 更新: 仲有一件事,就係可吾可以教下小弟數呢!!! 如果教完之後我識嘅,咁我就比你(100點) 吾識不過有比心機教都有(75點) 有興趣嘅通知小弟一下,我先加粉絲因為暑假快完啦,不過仲未做曬d暑期作業, 所以想搵人教下我咁囉,同埋我都吾想成日抄人d答案希望有心人能幫助!!!!!!!! 更新 2: 如上,求助內容有: Linear Equation in two Unknowns Rate and Ratio Congruence and Similarity Simple Introduction to Deductive Geometry Rational and Irrational Numbers 教我點簡單d計,例題等

最佳解答:

1. = (-x/2) – [x(x-2)/2] = x square +x – 2 / 2 = (x+2)(x-1) / 2 ? ans 2a. 24 = 1/2 (2+4)h 24 = (2+4)h/2 24 = 3h h = 8 ? ans b. 40 = 1/2(3 + b)8 40/8 = (3+b)/2 10 = 3 + b b = 7 ? ans 3a. 1/f = (1/2) – (1/3) 1/f = (3 - 2)/6 1/f = 1/6 f = 6 (交叉相乘) ? ans 3b. 唔識 4a. S = (8/2) – 5 S = -1 ? ans b. 15 = (a/2) – 7 15 = (a - 14)/2 30 = a – 14 a = 44 ? ans 5. 我諗我應該未學過 le d都係我自己計, 唔sure一定啱架,希望幫到你啦;)

其他解答:

thank you Godfrey|||||3.Given that 1/f=(1/u)-(1/v). b. If f=42 and u=6,find the value of v. 1/42 = 1/6 – 1/v 1/v = 1/6 – 1/42 1/v = 7/42 – 1/42 1/v = 6/42 flip it v/1 = 42/6 v = 7 (Answer) 2012-08-22 10:53:53 補充： 5.Change the subject of the following formulae to x. ^a.4mx=3(n-x) 4mx = 3n - 3x 4mx +3x = 3n x(4m +3) = 3n x = 3n/(4m +3) ^b.x/(x-y)=z x = z(x - y) x = zx - yz yz = zx - x zx - x = yz x(z - 1) = yz x = yz/(z - 1)