问题 解答题
下面各题,怎样简便怎样算.
(1)199+99×99
(2)75÷4+24×
1
4
+
1
4

(3)35.4-2.76+64.6+7.24
(4)(
3
4
+0.2)÷0.25×250%
答案

(1)199+99×99

=199+99×(100-1),

=199+99×100-99×1,

=199+9900-99,

=199-99+9900,

=100+9900,

=10000;

(2)75÷4+24×

1
4
+
1
4

=75×

1
4
+24×
1
4
+
1
4

=(75+24+1)×

1
4

=100×

1
4

=25;

(3)35.4-2.76+64.6+7.24

=35.4+64.6-2.26+7.24,

=100-2.26+7.24,

=97.74+7.24,

=104.98;

(4)(

3
4
+0.2)÷0.25×250%

=(0.75+0.2)×250%÷0.25,

=0.95×(2.5÷0.25),

=0.95×10,

=9.5.

填空题
单项选择题