题目内容
用递等式计算,能简算的要简算.
①
| ②7.05-3.67-1.33 | ③4.32×99 | ||||||||||||||||
④2.6×35+64×2
| ⑤
| ⑥(
|
考点:分数的简便计算,运算定律与简便运算,分数的四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:①根据加法交换律和结合律进行简算;
②根据减法的性质进行简算;
③根据乘法分配律进行简算;
④根据乘法分配律进行简算;
⑤先算减法,再算除法,最后算乘法;
⑥根据乘法分配律进行简算.
②根据减法的性质进行简算;
③根据乘法分配律进行简算;
④根据乘法分配律进行简算;
⑤先算减法,再算除法,最后算乘法;
⑥根据乘法分配律进行简算.
解答:
解:①
+4
+
+5
=(
+
)+(4
+5
)
=1+10
=11;
②7.05-3.67-1.33
=7.05-(3.67+1.33)
=7.05-5
=2.05;
③4.32×99
=4.32×(100-1)
=4.32×100-4.32×1
=432-4.32
=427.68;
④2.6×35+64×2
+2.6
=2.6×35+64×2.6+2.6
=2.6×(35+64+1)
=2.6×100
=260;
⑤
×[(
-
)÷1
]
=
×[
÷1
]
=
×
=
;
⑥(
+
-
)×72
=
×72+
×72-
×72
=42+20-27
=62-27
=35.
5 |
9 |
9 |
16 |
4 |
9 |
7 |
16 |
=(
5 |
9 |
4 |
9 |
9 |
16 |
7 |
16 |
=1+10
=11;
②7.05-3.67-1.33
=7.05-(3.67+1.33)
=7.05-5
=2.05;
③4.32×99
=4.32×(100-1)
=4.32×100-4.32×1
=432-4.32
=427.68;
④2.6×35+64×2
3 |
5 |
=2.6×35+64×2.6+2.6
=2.6×(35+64+1)
=2.6×100
=260;
⑤
4 |
15 |
25 |
12 |
5 |
8 |
2 |
3 |
=
4 |
15 |
35 |
24 |
2 |
3 |
=
4 |
15 |
7 |
8 |
=
7 |
30 |
⑥(
7 |
12 |
5 |
18 |
3 |
8 |
=
7 |
12 |
5 |
18 |
3 |
8 |
=42+20-27
=62-27
=35.
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定律简便计算.
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