题目内容
用递等式计算,能简算的要简算
|
| ||||||||||||
(3+135×20%)÷
|
4.35+
|
分析:(1)按照先算括号里面的减法,再算乘法,最后算加法顺序解答,
(2)按照从左到右顺序计算解答,
(3)运用乘法分配律解答,
(4)运用加法交换律和结合律解答.
(2)按照从左到右顺序计算解答,
(3)运用乘法分配律解答,
(4)运用加法交换律和结合律解答.
解答:解:(1)
+(1-
)×
=
+
×
=
+
=
;
(2)
÷
×
=
×
=4;
(3)(3+135×20%)÷
=3×
+27×
=7+63
=70;
(4)4.35+
+5.65+
=(4.35+5.65)+(
+
)
=10+1
=11.
1 |
2 |
2 |
5 |
1 |
3 |
=
1 |
2 |
3 |
5 |
1 |
3 |
=
1 |
2 |
1 |
5 |
=
7 |
10 |
(2)
1 |
3 |
1 |
14 |
6 |
7 |
=
14 |
3 |
6 |
7 |
=4;
(3)(3+135×20%)÷
3 |
7 |
=3×
7 |
3 |
7 |
3 |
=7+63
=70;
(4)4.35+
4 |
7 |
3 |
7 |
=(4.35+5.65)+(
4 |
7 |
3 |
7 |
=10+1
=11.
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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