56 56X99怎么用简便计算

问题描述:

56 56X99怎么用简便计算

5656×99
=56×101×99
=56×9999
=56×(10000-1)
=56×10000-56×1
=560000-56
=559944

5656X99
=56 56X(100-1)
=5656X100-5656
=565600-5656
=559944

5656×99=5656×(100-1)=5656×100-(5600+56)=565600-5600-56=560000-56=559944

5656x100-5656

56X99=56X(100-1)=56X100-56=5600-56=5544