题目内容

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=
(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.
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