题目内容
脱式计算,能简算的要简算 ①2006-4848÷96×2.4 |
②31.9×18-8×31.9 | ||||||||||||||||
③
|
④
|
分析:①先算乘除,再算加减;②根据乘法分配律简便计算;③运用加法的结合律及交换律进行计算,④先计算括号里面的,再计算括号外面的除法;
解答:解:①2006-4848÷96×2.4,
=2006-50.5×2.4,
=2006-121.2,
=1884.8;
②31.9×18-8×31.9,
=31.9×(18-8),
=319;
③
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
④
×[
-(
-
)],
=
×[
-(
-
)],
=
×[
-
],
=
×
,
=
.
=2006-50.5×2.4,
=2006-121.2,
=1884.8;
②31.9×18-8×31.9,
=31.9×(18-8),
=319;
③
13 |
14 |
13 |
15 |
1 |
14 |
2 |
15 |
=(
13 |
14 |
1 |
14 |
13 |
15 |
2 |
15 |
=1+1,
=2;
④
8 |
9 |
3 |
4 |
15 |
16 |
3 |
4 |
=
8 |
9 |
3 |
4 |
15 |
16 |
12 |
16 |
=
8 |
9 |
12 |
16 |
3 |
16 |
=
8 |
9 |
9 |
16 |
=
1 |
2 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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