题目内容
递等式计算(能简便的要简算)
|
| ||||||||||||||
(156×
|
2012+558÷18×24 | ||||||||||||||
| 3.87+1.44-0.87+0.56 | 35×(1-
|
分析:(1)先算除法,再算加法;
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算小括号里面的乘法,再算小括号里面的减法,再算括号外的乘法;
(4)先算除法,再算乘法,最后算加法;
(5)运用加法交换律和结合律简算;
(6)先算小括号里面的减法,再算括号外的乘法,最后算除法.
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算小括号里面的乘法,再算小括号里面的减法,再算括号外的乘法;
(4)先算除法,再算乘法,最后算加法;
(5)运用加法交换律和结合律简算;
(6)先算小括号里面的减法,再算括号外的乘法,最后算除法.
解答:解:(1)
+
÷
,
=
+
,
=
;
(2)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)(156×
-26)×
,
=(48-26)×
,
=22×
,
=16;
(4)2012+558÷18×24,
=2012+31×24,
=2012+744,
=2756;
(5)3.87+1.44-0.87+0.56,
=(3.67-0.87)+(1.44+0.56),
=3-2,
=1;
(6)35×(1-
)÷
,
=35×
÷
,
=20÷
,
=48.
| 1 |
| 6 |
| 2 |
| 7 |
| 3 |
| 7 |
=
| 1 |
| 6 |
| 2 |
| 3 |
=
| 5 |
| 6 |
(2)
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 5 |
| 4 |
| 3 |
=
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
=
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
(3)(156×
| 4 |
| 13 |
| 8 |
| 11 |
=(48-26)×
| 8 |
| 11 |
=22×
| 8 |
| 11 |
=16;
(4)2012+558÷18×24,
=2012+31×24,
=2012+744,
=2756;
(5)3.87+1.44-0.87+0.56,
=(3.67-0.87)+(1.44+0.56),
=3-2,
=1;
(6)35×(1-
| 3 |
| 7 |
| 5 |
| 12 |
=35×
| 4 |
| 7 |
| 5 |
| 12 |
=20÷
| 5 |
| 12 |
=48.
点评:本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进行简便计算.
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