题目内容

递等式计算(能简算的要简算)
4920÷24×20.
4
2
5
-
1
3
×1
2
7

2
5
7
+1.85+1
2
7
+7.15
1.4+(
5
8
-0.25)÷1
1
4

1.4×3
2
9
-1
2
5
×2
2
9

3.3×[38+3
1
5
÷(1
3
4
-0.15)].
4920÷24×20
=205×20
=4100;
4
2
5
-
1
3
×1
2
7

=4
2
5
-
1
3
×
9
7

=4
14
35
-
15
35

=3
34
35

2
5
7
+1.85+1
2
7
+7.15
=(2
5
7
+1
2
7
)+(1.85+7.15)
=4+9
=13;
1.4+(
5
8
-0.25)÷1
1
4

=1.4+0.375÷1.25
=1.4+0.3
=1.7;
1.4×3
2
9
-1
2
5
×2
2
9

=1.4×(3
2
9
-2
2
9

=1.4×1
=1.4;
3.3×[38+3
1
5
÷(1
3
4
÷0.15)]
=3.8×[38+
16
5
÷(
7
4
×
20
3
)]
=3.8×[38+
16
5
÷
35
3
]
=3.8×[38+
16
5
×
3
35
]
=3
4
5
×38
48
165

=
19
5
×
6318
165

=
120042
825

=145
417
825
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