5/4+3/7=

5/4+3/7= 3/4-5/7=?3/5+5/8=? 3+4-3+5-4+7-5= 7/3X:(7/4-72)=5:4 (3x/7):(4x/7-72)=5:4 7.75-（4/7+3/5）=? x-5/7x=3/4 (5x+7)-(4x+3)= 7x-5/4=3/8 5x+3-4x-7=? x+4/5x=3/7 3x-7/4-5x+7/3=1 5*3*8*6*0*5*7*5*8*3*4/3/4/7=? 3*4=4 5 6 2*7= 7 8 问：5*4=? 7/1+7/2+7/3+7/4+7/5+.7/24= x/5+4/5x=3/7+5/14 (5x-3)/4=3+(7x+5)/6 填上合适的符号使得等式成立7 7 7 7 =2 7 7 7 7 =3 7 7 7 7 =4 7 7 7 7 =5 7 7 7 7=6 7 7 7 7 =7 7 7 7 7=7 7 7 7 =9 7 7 7 7 =14