(6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)根据数据特点,假设:7/1+8/1+9/1=b,则:上式=(6/1+a)x b-(6/1+b)xa6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)根据数据特点,假设

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(6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)根据数据特点,假设:7/1+8/1+9/1=b,则:上式=(6/1+a)x b-(6/1+b)xa6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)根据数据特点,假设
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(6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)根据数据特点,假设:7/1+8/1+9/1=b,则:上式=(6/1+a)x b-(6/1+b)xa6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)根据数据特点,假设
(6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)
根据数据特点,假设:7/1+8/1+9/1=b,
则:上式=(6/1+a)x b-(6/1+b)xa
6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)
根据数据特点,假设:7/1+8/1+9/1=b,
则:上式=(6/1+a)x b-(6/1+b)x a
=

(6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)根据数据特点,假设:7/1+8/1+9/1=b,则:上式=(6/1+a)x b-(6/1+b)xa6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)根据数据特点,假设
(6/1+7/1+8/1)x(7/1+8/1+9/1)-(6/1+7/1+8/1+9/1)x(7/1+8/1)
根据数据特点,假设:7/1+8/1+9/1=b,7/1+8/1=a
b-a=7/1+8/1+9/1-7/1-8/1=9/1
则:上式=(6/1+a)x b-(6/1+b)x a
=(6/1×b+ab)-(6/1×a+ab)
=6/1×b+ab-6/1×a-ab
=6/1×(b-a)
=6/1×9/1
=54/1

6/1?是六分之一的意思吗 是1/6吧

怎么没问题呢?

拆开后得6/1(b-a)=6/1x9/1=54/1

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