简便计算 4分之1×4分之1+4分之3×4分之1

问题描述:

简便计算 4分之1×4分之1+4分之3×4分之1

=16分之1+16分之3
=16分之4
=4分之1

用分配律:(1/4)*(1/4)+(3/4)*(1/4)=(1/4+3/4)*(1/4)=1*(1/4)=1/4。

1/4 × 1/4 + 3/4 × 1/4
=1/4 ×(1/4 + 3/4)
=1/4 × 1
=1/4

=4分之1