题目内容
(2012?洪山区)能简便的要用简便方法计算,写出主要过程
(1)360+240÷15×28 | (2)6÷2.4-0.3×1.4 | (3)
|
(4)(
|
分析:(1)先算除法,再算乘法,最后算加法;
(2)同时运算除法和乘法,最后算减法;
(3)运用乘法分配律简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算括号外的乘法.
(2)同时运算除法和乘法,最后算减法;
(3)运用乘法分配律简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算括号外的乘法.
解答:解:(1)360+240÷15×28,
=360+16×28,
=360+448,
=808;
(2)6÷2.4-0.3×1.4,
=2.5-0.42,
=2.08;
(3)
×6+6×
,
=(
+
)×6,
=1×6,
=6;
(4)(
-0.4)÷
×
,
=
÷
×
,
=
×
,
=
.
=360+16×28,
=360+448,
=808;
(2)6÷2.4-0.3×1.4,
=2.5-0.42,
=2.08;
(3)
3 |
7 |
4 |
7 |
=(
3 |
7 |
4 |
7 |
=1×6,
=6;
(4)(
2 |
3 |
2 |
3 |
3 |
4 |
=
4 |
15 |
2 |
3 |
3 |
4 |
=
2 |
5 |
3 |
4 |
=
3 |
10 |
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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