题目内容
简便计算
①(
+
+
)×68 ②4.65-1.37-2.63.
①(
1 |
10 |
7 |
6 |
5 |
10 |
分析:①运用加法结合律简算;
②运用减去两个数,等于减这两个数的和简算.
②运用减去两个数,等于减这两个数的和简算.
解答:解:①(
+
+
)×68,
=(
+
+
)×68,
=(
+
)×68,
=
×68,
=
;
②4.65-1.37-2.63,
=4.65-(1.37+2.63),
=4.65-4,
=0.65.
1 |
10 |
7 |
6 |
5 |
10 |
=(
1 |
10 |
5 |
10 |
7 |
6 |
=(
3 |
5 |
7 |
6 |
=
53 |
30 |
=
1802 |
15 |
②4.65-1.37-2.63,
=4.65-(1.37+2.63),
=4.65-4,
=0.65.
点评:记住各种简算的方法,并灵活运用.
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