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(1)200.2×20.01-200.1×19.99(2)(1+12)×(1−12)×(1+13)×(1−13)×…×(1+199)×(1−199)(3)3.14×4310+3.14×7.2−0.314×15(4)5+51×2+52×3+53×4+…+599×100.
题目详情
(1)200.2×20.01-200.1×19.99
(2)(1+
)×(1−
)×(1+
)×(1−
)×…×(1+
)×(1−
)
(3)3.14×4
+3.14×7.2−0.314×15
(4)5+
+
+
+…+
.
(2)(1+
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
99 |
1 |
99 |
(3)3.14×4
3 |
10 |
(4)5+
5 |
1×2 |
5 |
2×3 |
5 |
3×4 |
5 |
99×100 |
▼优质解答
答案和解析
(1)200.2×20.01-200.1×19.99
=200.2×(20+0.01)-200.1×(20-0.01)
=200.2×20+200.2×0.01-200.1×20+200.1×0.01
=(200.2-200.1)×20+(200.2+200.1)×0.01
=0.1×20+400.3×0.01
=2+4.003
=6.003;
(2)(1+
)×(1-
)×(1+
)×(1-
)×…×(1+
)×(1-
)
=(1-
)×(1+
)×(1-
)×(1+
)×…(1-
)×(1+
)
=
×
×
×
×
×
…
×
=
×
=
;
(3)3.14×4
+3.14×7.2-0.314×15
=3.14×4.3+3.14×7.2-3.14×1.5
=3.14×(4.3+7.2-1.5)
=3.14×10
=31.4;
(4)5+
+
+
+…+
=5×(1+
=200.2×(20+0.01)-200.1×(20-0.01)
=200.2×20+200.2×0.01-200.1×20+200.1×0.01
=(200.2-200.1)×20+(200.2+200.1)×0.01
=0.1×20+400.3×0.01
=2+4.003
=6.003;
(2)(1+
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
99 |
1 |
99 |
=(1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
99 |
1′ |
99 |
=
1 |
2 |
3 |
2 |
2 |
3 |
4 |
3 |
3 |
4 |
5 |
4 |
98 |
99 |
100 |
99 |
=
1 |
2 |
100 |
99 |
=
50 |
100 |
(3)3.14×4
3 |
10 |
=3.14×4.3+3.14×7.2-3.14×1.5
=3.14×(4.3+7.2-1.5)
=3.14×10
=31.4;
(4)5+
5 |
1×2 |
5 |
2×3 |
5 |
3×4 |
5 |
99×100 |
=5×(1+
1 | ||||||||||||||
作业帮用户
2016-12-02
|
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