(1000-46*21)*15用简便算式

Question

(1000-46*21)*15用简便算式

Answer 1

解: (1000-46*21)*15

=[1000-46*(20+1)]*15

=(1000-920-46)*15

=(80-46)*15

=34*15

=17*(2*15)

=17*30

=510

Answer 2

(1000-46x21)x15
=[1000-46x(20+1)]x15
=[1000-(46x20+46)]x15
=[1000-920-46]x15
=[1000-966]x15
=33x15
=33x(10+5)
=33x10+33x5
=330+165
=495