23×
13
24
+
13
24
=
7.2×
3
4
+7.2÷4=
17.48×37-174.8×1.9+17.48×82= 32×25×125=
分析:①利用乘法分配律簡算;
②除以4化成乘
1
4
,然后利用乘法分配律簡算;
③把174.8×1.9化成17.48×19,然后利用乘法分配律簡算;
④把32化成4×8,然后利用乘法交換律及乘法結合律簡算,即可得解.
解答:解:①23×
13
24
+
13
24

=(23+1)×
13
24

=24×
13
24

=13;

②7.2×
3
4
+7.2÷4
=7.2×
3
4
+7.2×
1
4

=7.2×(
3
4
+
1
4

=7.2×1
=7.2;

③17.48×37-174.8×1.9+17.48×82
=17.48×37-17.48×19+17.48×82
=17.48×(37-19+82)
=17.48×100
=1748;

④32×25×125
=4×8×25×125
=(25×4)×(125×8)
=100×1000
=100000.
點評:此題是考查四則混合運算,要仔細觀察算式的特點,靈活運用一些定律進行簡便計算.
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