0.45*99-0.9*49.5简算怎么算

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0.45*99-0.9*49.5简算怎么算

0.45*99-0.9*49.5
=0.45*99-0.45*2*49.5
=0.45(99-99)
=0

0.45×99-0.9 ×49.5=0.45×99-0.45 ×(2×49.5)
=0.45×99-0.45×99
=0