5×(2x-7)=16×5/82x-7=10÷52x=9x=4.5
5/16=5/8:(2x-7) 2X-7=2 x=4.5
5:16=5/8:(2x-7)2x+7=16x5/8÷52x+7=22x=2-72x=-5x=-2.5
老师10÷5怎么等于9