问题
解答题
用简便方法计算
(1)6.81+6.81×99
(2)0.25×185×40
(3)10.1×2.36.
答案
(1)6.81+6.81×99
=6.81×(99+1)
=6.81×100
=681;
(2)0.25×185×40
=(0.25×40)×185
=10×185
=1850;
(3)10.1×2.36
=(10+0.1)×2.36
=10×2.36+0.1×2.36
=23.6+0.236
=23.836.