问题 解答题

计算下面各题,能简便的用简便方法计算.

(841-41)÷25×4

83×29+71×83

101×99

199+199×99

560÷[490÷(34+36)]

28×37+73×37-37.

答案

(1)(841-41)÷25×4

=800÷25×4

=32×4

=128;

(2)83×29+71×83

=83×(29+71)

=86×100

=8500;

(3)101×99

=(100+1)×99

=100×99+1×99

=9900+99

=9999;

(4)199+199×99

=(199+1)×99

=200×99

=19800;

(5)560÷[490÷(34+36)]

=560÷[490÷70]

=560÷7

=80;

(6)28×37+73×37-37

=(28+73-1)×37

=100×37

=3700.

问答题 简答题
问答题 简答题