1.(32×1/4+17)÷5/12 =(8+17)÷5/12 = 25×12/5 = 602. 18/25×9/16+7/25×9/16+9/16 =18/25×9/16+7/25×9/16+1×9/16 =(18/25+7/25+1)×9/16 =2×9/16 =9/8希望能帮到你!