Question

用简便方法计算下面各题(脱式计算）:(1)66x21+19x21+85x19 (2)36x111+888x8 (3)99

Answer 1

1、66×21+19×21+85×19

=(66+19)×21+85×19

=85×21+85×19

=(21+19)×85

=40×85

=3600

2、36×111+888×8

=36×111+111×64

=(36+64)×111

=100×111

=11100

3、99×99+199

=(100-1)×99+199

=100×99-99+199

=9900+100

=10000

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