题目内容
脱式计算,请细心.(能简算的要简算)
①3.8×
+10.4×
②96×
+24÷
③101×56-56
④
×[
÷(
-
)].
①3.8×
3 |
14 |
3 |
14 |
②96×
3 |
4 |
4 |
5 |
③101×56-56
④
8 |
15 |
5 |
6 |
7 |
9 |
1 |
3 |
考点:整数、分数、小数、百分数四则混合运算,整数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:①③运用乘法分配律简算.
②先算乘除,再算加法.
④先算小括号内的,再算中括号内的,最后算括号外的.
②先算乘除,再算加法.
④先算小括号内的,再算中括号内的,最后算括号外的.
解答:
解:①3.8×
+10.4×
=(3.8+10.4)×
=14.2×
=
×
=
②96×
+24÷
=72+24×
=72+30
=102
③101×56-56
=(101-1)×56
=100×56
=5600
④
×[
÷(
-
)]
=
×[
÷
]
=
×[
×
]
=
×
=1
3 |
14 |
3 |
14 |
=(3.8+10.4)×
3 |
14 |
=14.2×
3 |
14 |
=
71 |
5 |
3 |
14 |
=
213 |
70 |
②96×
3 |
4 |
4 |
5 |
=72+24×
5 |
4 |
=72+30
=102
③101×56-56
=(101-1)×56
=100×56
=5600
④
8 |
15 |
5 |
6 |
7 |
9 |
1 |
3 |
=
8 |
15 |
5 |
6 |
4 |
9 |
=
8 |
15 |
5 |
6 |
9 |
4 |
=
8 |
15 |
15 |
8 |
=1
点评:此题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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