(1)1/8×75%÷1/8×75%=75%×75%=9/16(2)(6.9+6.9+6.9+6.9)×25%=6.9x4x25%=6.9(3)70%×24.5+0.7×76.5-70%=0.7x(24.5+76.5-1)=0.7x100=70(4)7/6-(40%+3/5)×5/6=7/6-5/6=1/3(5)(1÷75%+1 5/6×2)×0.3 =(4/3+11/3)x0.3=5x0.3=1.5