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①30%×2.84+22125×1.7+2.84×1.5②13+18+115+…+1120③(114+523+334+913)×(2-720)
题目详情
①30%×2.84+2
×1.7+2.84×1.5
②
+
+
+…+
③(1
+5
+3
+9
)×(2-
)
21 |
25 |
②
1 |
3 |
1 |
8 |
1 |
15 |
1 |
120 |
③(1
1 |
4 |
2 |
3 |
3 |
4 |
1 |
3 |
7 |
20 |
▼优质解答
答案和解析
①30%×2.84+2
×1.7+2.84×1.5,
=0.3×2.84+2.84×1.7+2.84×1.5,
=2.84×(0.3+1.7+1.5),
=2.84×3.5,
=9.94;
②
+
+
+…+
,
=
+
+
+…+
,
=
×[(1-
)+(
-
)+(
-
)+…+(
-
)],
=
×(1+
-
-
),
=
×
,
=
;
③(1
+5
+3
+9
)×(2-
),
=[(1
+
21 |
25 |
=0.3×2.84+2.84×1.7+2.84×1.5,
=2.84×(0.3+1.7+1.5),
=2.84×3.5,
=9.94;
②
1 |
3 |
1 |
8 |
1 |
15 |
1 |
120 |
=
1 |
1×3 |
1 |
2×4 |
1 |
3×5 |
1 |
10×12 |
=
1 |
2 |
1 |
3 |
1 |
2 |
1 |
4 |
1 |
3 |
1 |
5 |
1 |
10 |
1 |
12 |
=
1 |
2 |
1 |
2 |
1 |
11 |
1 |
12 |
=
1 |
2 |
175 |
132 |
=
175 |
264 |
③(1
1 |
4 |
2 |
3 |
3 |
4 |
1 |
3 |
7 |
20 |
=[(1
1 |
4 |
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2016-12-11
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