Question

(a-b)(8/a+6/b)(1/2)=5怎么化简?

Answer 1

主要是运用乘法分配率.(1/2)(a-b)(8/a+6/b)=(1/2)(a*8/a+a*6/b-b*8/a-b*6/b)=(1/2)(8+6a/b-8b/a-6)=(1/2)(6a/b-8b/a+2)=5 再将式子进一步简化,6a/b-8b/a+2=10,6a/b-8b/a=8,两边同除2,得3a/b-4b/a=4 于是就解决了,欢迎追问,如已明白,