口算.
37+73= 20×50= 123÷3= 4×50= 80-28= 60×13=
6+0.4= 6-0.4= 3.5+2.8=
1
7
+
5
7
=
1-
3
5
=
5
9
-
5
9
=
分析:第一排根據整數(shù)四則運算的法則求解;
6+0.4,6-0.4,3.5+2.8根據小數(shù)加減法的運算法則求解;
1
7
+
5
7
,1-
3
5
,
5
9
-
5
9
根據同分母分數(shù)加減法:分母不變,分子相加減.
解答:解:
37+73=110, 20×50=1000, 123÷3=41, 4×50=200, 80-28=52, 60×13=780,
6+0.4=6.4, 6-0.4=5.6, 3.5+2.8=6.3,
1
7
+
5
7
=
6
7
,
1-
3
5
=
2
5
5
9
-
5
9
=0.
點評:本題考查了簡單的計算,要注意根據運算法則快速、準確的得出答案.
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