第十九题.填空,不难.我算了答案不正确.

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第十九题.填空,不难.我算了答案不正确.
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第十九题.填空,不难.我算了答案不正确.
第十九题.填空,不难.我算了答案不正确.
 

第十九题.填空,不难.我算了答案不正确.

1

19.
[(1/2)*(1/5)]*(1/8).......................(a1*b1)*1/8;{a1=1/2、b1=1/5}
=[(1/2+1/5)/[1-(1/2×1/5)]*(1/8).....[(a1+b1)/(1-a1×b1)]*1/8
=[(7/10)/(9/10)]*(1/8)
=(7/9)*(1/8)...

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19.
[(1/2)*(1/5)]*(1/8).......................(a1*b1)*1/8;{a1=1/2、b1=1/5}
=[(1/2+1/5)/[1-(1/2×1/5)]*(1/8).....[(a1+b1)/(1-a1×b1)]*1/8
=[(7/10)/(9/10)]*(1/8)
=(7/9)*(1/8)..................................a2*b2;{a2=7/9、b2=1/8}
=(7/9+1/8)/(1-7/9×1/8).................(a2+b2)/(1-a2×b2)
=(65/72)/(65/72)
=1

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