原式=8x275x(1000-1)/(37x11)
=2200x1000/407-2200x1/407
=2200000/407-2200/407
=5405又165/407-5又165/407
=5400又165/407
999×8×275÷37÷11
=(999÷37)×8×(275÷11)
=27×8×25
=27×(8×25)
=27×200
=5400
999×8×275÷37÷11
=999×8×(275÷11)÷37
=999×8×25÷37
=(999÷37)×(8×25)
=27x200
=5400
648÷8×(121÷11)
=(640+8)÷8x【(110+11)÷11】
=(640÷8+8÷8)x【(110÷11)+(11÷11)】
=81x11
=81x10+81x1
=810+81
=891