用简便方法计算(1)85×386(2)524×25(3)32×43×54×…×101100×102101(4)11×3+13×5+15×7+…+117×19(5)14+128+170+1130.-数学
题文
用简便方法计算 (1)85×
(2)
(3)
(4)
(5)
|
答案
(1)85×
=(86-1)×
=86×
=3-
=2
(2)
=
=
=5+
=5
(3)
|
题文
用简便方法计算 (1)85×
(2)
(3)
(4)
(5)
|
答案
(1)85×
=(86-1)×
=86×
=3-
=2
(2)
=
=
=5+
=5
(3)
|