计算:200.8×73-6.3×2008 &nbs
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/09/01 07:45:45
计算:
200.8×73-6.3×2008
9999×2222+3333×3334
(1+
200.8×73-6.3×2008
9999×2222+3333×3334
(1+
1 |
2 |
①200.8×73-6.3×2008
=2008×7.3-6.3×2008
=2008×(7.3-6.3)
=2008×1
=2008;
②9999×2222+3333×3334
=3333×6666+3333×3334
=3333×(6666+3334)
=3333×10000
=33330000;
③(1+
1
2)×(1-
1
2)×(1+
1
3)×(1-
1
3)×…(1+
1
99)×(1-
1
99)
=
3
2×
1
2×
4
3×
2
3×…×
99
98×
97
98×
100
99×
98
99
=
100
2×99
=
50
99.
=2008×7.3-6.3×2008
=2008×(7.3-6.3)
=2008×1
=2008;
②9999×2222+3333×3334
=3333×6666+3333×3334
=3333×(6666+3334)
=3333×10000
=33330000;
③(1+
1
2)×(1-
1
2)×(1+
1
3)×(1-
1
3)×…(1+
1
99)×(1-
1
99)
=
3
2×
1
2×
4
3×
2
3×…×
99
98×
97
98×
100
99×
98
99
=
100
2×99
=
50
99.