標題:

F.4 Maths

發問:

A picture with dimensions 16cm*20cm is mounted on a cardboard. The width of frame is uniform. If the area of the frame is 352cm^2, find the width of the frame..

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最佳解答:

let xcm be the width of the frame (16+2x)(20+2x)-(16x20)=352 320+32x+40x+4x^2-320=352 4x^2+72x=352 4x^2+72x-352=0 (x-4)(x+22)=0 x=4 or -22(rejected) therefore,the width of the frame is 4cm

其他解答:7638E7481407D16B
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