5/17×0.375+9/17×7/24= 5/17×3/8+9/17×7/24= 5/17×9/24+9/17×7/24= 9/17×5/24+9/17×7/24=9/17×(5/24+7/24)=9/17×12/24=9/17×1/2=9/34
