三年级口算题综合练习: 51-9×2= 83+6÷3= 34+8×1= 53+24÷6= 4×1+39= 19-16÷2= 27+9×1= 17-12÷2= 39-5×7= 70-6÷2= 2×9+25= 5÷1+48=