21×48+84×13简便计算?

2025-12-16 14:21:09
推荐回答(4个)
回答1:

回答2:

=21(48+13×4)
=21×(48+52)
=21×100
=2100

回答3:

解:原式=21x4x12+84x13
=21x4x12+21x4x13
=21x4x(12+13)
=21x(4x25)
=21x100
=2100

回答4:

=21x48+21x4x13
=21x48+21x52
=21x(48+52)
=21x100
=2100