题目内容
用递等式计算. 3060÷15-2.5×1.04 |
|
0.16+4÷(
| |||||||||||||||
|
|
分析:递等式,即四则混合运算.在四则混合运算的算式中,按照运算顺序把计算过程依次用等式表示出来,这样的等式叫做递等式.用递等式计算,即用四则混合运算来计算,采用乘法分配律,加法结合律,以及去括号等使问题简化.
解答:解:3060÷15-2.5×1.04,
=204-2.6,
=201.4;
×
+
÷
,
=
+
×9,
=
×(1+9),
=
×10,
=
,
=9
;
0.16+4÷(
-
),
=0.16+4÷
,
=0.16+4×4,
=0.16+16,
=16.16;
-[
-(
+
)],
=
-
+
+
,
=(
+
)-(
-
),
=1-1,
=0;
÷[(
+
)÷
]
=
÷(
+
)×
,
=
×
×
,
=
.
=204-2.6,
=201.4;
7 |
5 |
2 |
3 |
14 |
15 |
1 |
9 |
=
14 |
15 |
14 |
15 |
=
14 |
15 |
=
14 |
15 |
=
28 |
3 |
=9
1 |
3 |
0.16+4÷(
3 |
8 |
1 |
8 |
=0.16+4÷
1 |
4 |
=0.16+4×4,
=0.16+16,
=16.16;
3 |
7 |
19 |
5 |
14 |
5 |
4 |
7 |
=
3 |
7 |
19 |
5 |
14 |
5 |
4 |
7 |
=(
3 |
7 |
4 |
7 |
19 |
5 |
14 |
5 |
=1-1,
=0;
3 |
5 |
1 |
5 |
1 |
3 |
2 |
9 |
=
3 |
5 |
3 |
15 |
5 |
15 |
2 |
9 |
=
3 |
5 |
15 |
8 |
2 |
9 |
=
1 |
4 |
点评:此题考查了分数的四则混合运算,利用乘法分配律、去括号、加法结合律使问题简单化.
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