(11×10×9×8×7)÷56÷55÷18
(11×5×2×9×8×7)÷56÷55÷18
=(55×18×56)÷56÷55÷18
=1
11x10x9x8x7÷56÷55÷18
=(11x5)x(2x9)x(8x7)÷56÷55÷18
=55x18x56÷56÷55÷18
=(55÷55)x(18÷18)x(56÷56)
=1x1x1
=1
(11×10×9×8×7)÷56÷55÷18
=11×10×9×8×7÷(7×8)÷(11×5)÷(9×2)
=11×10×9×8×7÷7÷8÷11÷5÷9÷2
=10÷5÷2
=1