1.1x1.1x1.1-1.1x1.1-0.11
=1.1x1.1x1.1-1.1x1.1x1-0.11x1
=1.1x1.1x(1.1-1)-0.11x1
=1.1x1.1x0.1-0.11x1
=1.1x0.11-0.11x1
=(1.1-1)x0.11
=0.1x0.11
=0.011
1.1x1.1x1.1-1.1x1.1-0.11
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