脱式计算(能简算的要简算)(1)(13+14-124)×24(2)(1+12)×(1-12)×(1+13)×(1-13)×…×(1+19)×(1-19)(3)2007×20052006(4)2.5×0.875+0.25×1.25.-数学
题文
脱式计算(能简算的要简算) (1)(
(2)(1+
(3)2007×
(4)2.5×0.875+0.25×1.25. |
答案
(1)(
=
=8+6-1, =13; (2)(1+
=
|
题文
脱式计算(能简算的要简算) (1)(
(2)(1+
(3)2007×
(4)2.5×0.875+0.25×1.25. |
答案
(1)(
=
=8+6-1, =13; (2)(1+
=
|