题目内容
(2006?杭州模拟)计算:(能简便的要简便计算)
①2526-36×42÷27
②17.09-3.63-6.37
③1
×(
-
)
④5.6×3
-
×(9-2.5)
⑤0.25÷(
+0.2)-
.
①2526-36×42÷27
②17.09-3.63-6.37
③1
1 |
5 |
3 |
4 |
2 |
3 |
④5.6×3
1 |
2 |
3 |
5 |
⑤0.25÷(
4 |
5 |
1 |
4 |
分析:①③④⑤按照整数,小数分数的四则混合运算的顺序进行计算,有括号的先计算括号内部的再计算括号外面的.
②运用一个数连续减去两个数就用这个数减去这两个数的和.
②运用一个数连续减去两个数就用这个数减去这两个数的和.
解答:解:①2526-36×42÷27,
=2526-1512÷27,
=2526-56,
=2470;
②17.09-3.63-6.37,
=17.09-(3.63+6.37),
=17.09-10,
=7.09;
③1
×(
-
),
=
×(
-
),
=
×
,
=
;
④5.6×3
-
×(9-2.5),
=
×
-
×
,
=
-
,
=15.7;
⑤0.25÷(
+0.2)-
.
=0.25÷1-0.25,
=0.25-0.25,
=0.
=2526-1512÷27,
=2526-56,
=2470;
②17.09-3.63-6.37,
=17.09-(3.63+6.37),
=17.09-10,
=7.09;
③1
1 |
5 |
3 |
4 |
2 |
3 |
=
6 |
5 |
9 |
12 |
8 |
12 |
=
6 |
5 |
1 |
12 |
=
1 |
10 |
④5.6×3
1 |
2 |
3 |
5 |
=
28 |
5 |
7 |
2 |
3 |
5 |
13 |
2 |
=
196 |
10 |
39 |
10 |
=15.7;
⑤0.25÷(
4 |
5 |
1 |
4 |
=0.25÷1-0.25,
=0.25-0.25,
=0.
点评:本题考查了四则混合运算的顺序及运算法则,灵活运用所学的运算律或运算的技巧进行简便计算.
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