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直接写得数.450+300=64+7=480+70=298×6≈680-400=72-8=810-40=51×8≈4000×2=70×9=500×6=567×0=39+59=45-35=14+34=1-23=

题目详情
直接写得数.
450+300= 64+7= 480+70= 298×6≈
680-400= 72-8= 810-40= 51×8≈
4000×2= 70×9= 500×6= 567×0=
3
9
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5
9
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4
5
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5
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1
4
+
3
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1-
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450+300= 64+7= 480+70= 298×6≈
680-400= 72-8= 810-40= 51×8≈
4000×2= 70×9= 500×6= 567×0=
3
9
+
5
9
=
4
5
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3
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1
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450+300= 64+7= 480+70= 298×6≈450+300=64+7=480+70=298×6≈ 680-400= 72-8= 810-40= 51×8≈680-400=72-8=810-40=51×8≈ 4000×2= 70×9= 500×6= 567×0=4000×2=70×9=500×6=567×0=
3
9
+
5
9
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4
5
-
3
5
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1
4
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3
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1-
2
3
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3
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3
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3
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3399
5
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=
5
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5599
4
5
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4
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4455
3
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3355
1
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1
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1144
3
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2233
▼优质解答
答案和解析
450+300=750, 64+7=71, 480+70=550, 298×6≈1800,
680-400=280, 72-8=64, 810-40=770, 51×8≈400,
4000×2=8000, 70×9=630, 500×6=3000, 567×0=0,
3
9
+
5
9
=
8
9
4
5
-
3
5
=
1
5
1
4
+
3
4
=1,
1-
2
3
=
1
3
450+300=750, 64+7=71, 480+70=550, 298×6≈1800, 450+300=750,450+300=750, 64+7=71,64+7=71, 480+70=550,480+70=550, 298×6≈1800,298×6≈1800, 680-400=280, 72-8=64, 810-40=770, 51×8≈400, 680-400=280,680-400=280, 72-8=64,72-8=64, 810-40=770,810-40=770, 51×8≈400,51×8≈400, 4000×2=8000, 70×9=630, 500×6=3000, 567×0=0, 4000×2=8000,4000×2=8000, 70×9=630,70×9=630, 500×6=3000,500×6=3000, 567×0=0,567×0=0,
3
9
+
5
9
=
8
9
4
5
-
3
5
=
1
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1
4
+
3
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1-
2
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1
3
3
9
+
5
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=
8
9
3
9
+
5
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=
8
9
3
9
333999+
5
9
=
8
9
5
9
555999=
8
9
8
9
888999,
4
5
-
3
5
=
1
5
4
5
-
3
5
=
1
5
4
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444555-
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1
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3
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333555=
1
5
1
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111555,
1
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3
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1
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1
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111444+
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3
4
333444=1, 1-
2
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1
3
1-
2
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1
3
2
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222333=
1
3
1
3
111333.