0.75×3/8+1/4÷3/8=3/4×3/8+1/4×8/3=9/32+2/3=27/96+64/96=91/96如果是：0.75×8/3+1/4÷3/8=3/4×8/3+1/4×8/3=(3/4+1/4)×8/3=8/3如果是：0.75×3/8+1/4÷8/3=3/4×3/8+1/4×3/8=(3/4+1/4)×3/8=3/8