能简算的要简算99×9998-198(1.25+78)×8×73412×3+13×4+14×5+…+199×1003.6×42.3×3.75-12.5×0.423×28.-数学
题文
能简算的要简算
|
答案
(1)99×
=(98+1)×
=99+
=99+(
=99+1, =100; (2)(1.25+
=(1
=
=
(3)
|
题文
能简算的要简算
|
答案
(1)99×
=(98+1)×
=99+
=99+(
=99+1, =100; (2)(1.25+
=(1
=
=
(3)
|