题目内容
递等式计算(能简算的要简算)
4920÷24×20.
4
-
×1
2
+1.85+1
+7.15
1.4+(
-0.25)÷1
1.4×3
-1
×2
3.3×[38+3
÷(1
-0.15)].
4920÷24×20.
4
| 2 |
| 5 |
| 1 |
| 3 |
| 2 |
| 7 |
2
| 5 |
| 7 |
| 2 |
| 7 |
1.4+(
| 5 |
| 8 |
| 1 |
| 4 |
1.4×3
| 2 |
| 9 |
| 2 |
| 5 |
| 2 |
| 9 |
3.3×[38+3
| 1 |
| 5 |
| 3 |
| 4 |
4920÷24×20
=205×20
=4100;
4
-
×1
=4
-
×
=4
-
=3
;
2
+1.85+1
+7.15
=(2
+1
)+(1.85+7.15)
=4+9
=13;
1.4+(
-0.25)÷1
=1.4+0.375÷1.25
=1.4+0.3
=1.7;
1.4×3
-1
×2
=1.4×(3
-2
)
=1.4×1
=1.4;
3.3×[38+3
÷(1
÷0.15)]
=3.8×[38+
÷(
×
)]
=3.8×[38+
÷
]
=3.8×[38+
×
]
=3
×38
=
×
=
=145
.
=205×20
=4100;
4
| 2 |
| 5 |
| 1 |
| 3 |
| 2 |
| 7 |
=4
| 2 |
| 5 |
| 1 |
| 3 |
| 9 |
| 7 |
=4
| 14 |
| 35 |
| 15 |
| 35 |
=3
| 34 |
| 35 |
2
| 5 |
| 7 |
| 2 |
| 7 |
=(2
| 5 |
| 7 |
| 2 |
| 7 |
=4+9
=13;
1.4+(
| 5 |
| 8 |
| 1 |
| 4 |
=1.4+0.375÷1.25
=1.4+0.3
=1.7;
1.4×3
| 2 |
| 9 |
| 2 |
| 5 |
| 2 |
| 9 |
=1.4×(3
| 2 |
| 9 |
| 2 |
| 9 |
=1.4×1
=1.4;
3.3×[38+3
| 1 |
| 5 |
| 3 |
| 4 |
=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 |
| 48 |
| 165 |
=
| 19 |
| 5 |
| 6318 |
| 165 |
=
| 120042 |
| 825 |
=145
| 417 |
| 825 |
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