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What is the 300-crossing problem of the mixed operation of addition, subtraction, multiplication and division in the second volume of senior two?
6×6×3= 18-63÷7= ? 59+74-70= 100-2× 1= ? 8×5+45=

9×2- 1= 5 1- 19-0= ? 8×0+49= ? 3×4×9= ? 7×0+3 1=?

9-7- 1= ? 32÷8×6= ? 42÷6×2= ? 12÷4÷3= 36÷9×5=

144÷6÷4= 9×9-6 1= ? 72÷8- 1= 99-9÷3= ? 8×5- 14=?

7-3+ 13= 53-37-4= 74+3 1- 16= ? 6×8+3= ? 47- 1 1-2 1=?

75+5×3= ? 6×4+6 1= ? 40÷4-5= 432÷8÷9= 74-8×7=?

80÷ 10-4= 90÷9×5= ? 30÷5+58= ? 52+6×0= 62+86+70=?

30÷ 10+65= ? 108÷3÷4= 50- 1÷ 1= 15- 1-7= ? 75+24÷6=