x÷2/3=8/9x=8/9×2/3x=27分之16x+1/6x=4(1+1/6)x=47/6x=4x=4÷7/6x=7分之24x-2/7x=3/45/7x=3/4x=3/4÷5/7x=20分之213x+3/4x=7+1/215/4x=15/2x=15/2÷15/4x=2(5+1/4)x=7+1/221/4x=15/2x=15/2÷21/4x=7分之10
第一题27分之16
额