问题 解答题
用简便方法计算.
(1)18.12-(5.3+1.12)=
(2)2×
1
4
+
1
4
×5+
1
4
=
(3)2.5×3.2×1.25=(4)41×101=
答案

(1)18.12-(5.3+1.12),

=18.12-1.12-5.3,

=17-5.3,

=11.7;

(2)2×

1
4
+
1
4
×5+
1
4

=(2+5+1)×

1
4

=8×

1
4

=2;

(3)2.5×3.2×1.25,

=(2.5×0.4)×(8×1.25),

=1×10,

=10;

(4)41×101,

=41×100+41×1,

=4100+41,

=4141.

单项选择题
单项选择题