最佳答案:X-2/7X=3/470%X + 20%X = 3.625% + 10X =4/5X - 15%X = 68X+3/8 X=1215X-3×5/21 =5/11
最佳答案:(1)3/4x+5=6 (2)5/2x+1/3x=17 (3)2x+2-1/4x=16 (4)5/x+8=13 (5)3/8+5/16+6x=3-1/163/4