急問3題數學題~10!!－fksnlix的部落格

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急問3題數學題~10!!

發問:

1.(p-q)(x+r)=(p+q)(x-r) 2.C=620 P=500 n=6 C=P(1+nr/100) find r 3.k=4/ab-1/c find b 更新: 1.(p-q)(x+r)=(p+q)(x-r) find x

最佳解答:

1. px+pr-qx-qr=px-pr+qx-qr 2pr-2qx=0 pr-qx=0 2 . 620=500(1+6r/100) 620/500=1+6r/100 (620/100-1)x100/6=r r =520/6 =260/3 3. 4c-ab=kabc 4c-ab+kabc=o 4c-b(a-kac)=0 b=4c/a-kac hard working!

其他解答:

第一題不明白問什麼 2. C=620 P=500 n=6 C=P(1+nr/100) find r 620=500( 1+ 6r/100 ) 620=500+30r 30r=120 r=40 3. k=4/ab-1/c find b abck=4c - ab abck + ab = 4ck b( ack + a ) = 4ck b = 4ck / (ack+a) b = 4ck / a(ck+1)|||||我只解出第二題 620= 500(1+ 6r/100) 620/500 = 1+ 6r/100 620/500 - 1 = 6r/100 12/50 = 6r/100 12/50 x 100 = 6r 6r = 24 r = 4|||||ed澳數好難boo(奇), 上面的二位小朋友好傻,澳數(中學程度的數)都唔識,仲話ed係英文,唉,真係...|||||2.620=500(1+6r/100) 620=500+30r 120=30r r = 4 3. k=4/ab-1/c abc=4ck-abk 4ck=-abk-abc 4ck=b(-ak-ac) b= 4ck/-a(k+c)|||||Sorry I do not know what are you say ?|||||I do not know what are you say ? Your 問題 is English not Maths.F893957AEB7D5408