问题
解答题
|
答案
(1)28×199
=28×(200-1)
=28×200-28
=5600-28
=5572
(2)15×4×250×6
=(15×6)×(4×250)
=90×1000
=90000
(3)88×22+22×12
=(88+12)×22
=100×22
=2200
|
(1)28×199
=28×(200-1)
=28×200-28
=5600-28
=5572
(2)15×4×250×6
=(15×6)×(4×250)
=90×1000
=90000
(3)88×22+22×12
=(88+12)×22
=100×22
=2200