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.

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