kfsdgte的部落格

標題:

有無人識計呀....教下我

發問:

1 (a) Simplify (5x)^3+4-(6x)^2-x^3+3x-(4x)^2-x(Give your answer in descending order.)(b) Simplify [(2x)^2*y]/4xy^22. The perimeter of a rectangle is 36cm. Its length and width are 2x cm and x cm respectively.(a) Find length and width of rectangle.(b) Find the area of rectangle.3. Eva bought a watch for for... 顯示更多 1 (a) Simplify (5x)^3+4-(6x)^2-x^3+3x-(4x)^2-x (Give your answer in descending order.) (b) Simplify [(2x)^2*y]/4xy^2 2. The perimeter of a rectangle is 36cm. Its length and width are 2x cm and x cm respectively. (a) Find length and width of rectangle. (b) Find the area of rectangle. 3. Eva bought a watch for for $240. She made a profit of 20% when she sold it to peter later. (a) Find price that peter paid for the watch. (b)Peter then sold it for $316.8. Find his profit percentage.

最佳解答:

1(a) (5x)^3+4-(6x)^2-x^3+3x-(4x)^2-x =124x^3-52x^2+2x+4 (b)Simplify [(2x)^2*y]/4xy^2 =(4x^2*y)/4xy^2 =x 2(a) The perimeter of a rectangle is 36cm 2*(2x+x)=36 6x=36 x=6 The length is 12 cm and the width is 6 cm (b) the area of rectangle. =length *width =12*6 =72cm^2 3(a) price that peter paid for the watch. =240(1+20%) =240(1.2) =$288 (b) his profit percentage. =(316.8-288)/288*100% =10%

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