Q1.有A,B,C三條路, B路長18又5份之2km, B路是C路的1又3份之1倍, C路的長度是A路的5份3, A路長多少???請詳細解答
點解係(18又5份之2 除 1又3份之1 除 5份3) ,
而唔係(18又5份之2 乘 1又3份之1 乘 5份3) ??????
maths maths !!!!!!!!!!!!!!
2010-02-13 4:03 am
回答 (1)
2010-02-13 4:47 am
✔ 最佳答案
Q1.有A,B,C三條路, B路長18又5份之2km, B路是C路的1又3份之1倍, C路的長度是A路的5份3, A路長多少???請詳細解答B=(18+2/5)km
(1+1/3)C=B
C=B/(1+1/3) = (18+2/5)/(1+1/3) = (92/5)/(4/3) = 69/5 km
(3/5)A=C
A=C/(3/5) = (69/5)/(3/5) = 69/3 = 23km
點解係(18又5份之2 除 1又3份之1 除 5份3) ,
而唔係(18又5份之2 乘 1又3份之1 乘 5份3) ??????
因為佢話B係C的x倍,,,而唔係C係B的x倍,所以要除
而A果到亦是如此
參考: Hope can help you^^”
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