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中三數學一條 [5分]

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發問:

B比A高5%，而C則比B高20%。問C比A高百分之幾？

最佳解答:

{ B = A * (1+ 0.05) ... ... ( i ) ll( 5%= 0.05) C = B * (1 + 0.2 ) ... ... ( i i ) ll( 20% = 0.2) Put ( i ) into ( i i ), we have C = A * (1+ 0.05) * (1 + 0.2 ) = A * (1.05 )( 1.2 ) = A * (1.26 ) = A * (1 + 26% ) Therefore, C is 26% higer than A . *Hope it helps~

其他解答:

B = A * 1.05 C = B * 1.2 C = A * 1.05 * 1.2 C = A * 1.26 C比A高26%|||||0.05乘0.2乘100% =10%|||||b=a*1.05 c=b*1.2 所以 c=a*1.05*1.2=a*1.26 即係C比A高26%|||||Let height of A is X height of B = 1.05X height of C = 1.2 (1.05X) = 1.26 X Height of C : Height of A = 1.26X : X C is taller than A of 26%