问题 解答题
计算下列各题.
(1)(102.5×56+77.5×24)÷304 
(2)999×222+333×334
(3)1.44÷[1.2×(0.832+0.368)]
(4)32.6×51.4+674×5.14
(5)(1+
1
2
)×(1-
1
2
)×(1+
1
3
)×(1-
1
3
)×…×(1+
1
99
)×(1-
1
99
答案

(1)(102.5×56+77.5×24)÷304,

=(102.5×7×8+77.5×3×8)÷304,

=(717.5+232.5)×8÷304,

=950×8÷304,

=25;

(2)999×222+333×334,

=333×3×222+333×334,

=333×(666+334),

=333×1000,

=333000;

(3)1.44÷[1.2×(0.832+0.368)],

=1.44÷[1.2×1.2],

=1.44÷1.44,

=1;

(4)32.6×51.4+674×5.14,

=326×5.14+674×5.14,

=(326×+674)×5.14,

=1000×5.14,

=5140;

(5)(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
×…×
100
99
×
98
99

=(3×1×4×2×5×3×6×4×…×99×97×100×98)÷(2×3×4×5×…×98×99)2

=100÷(2×99),

=

50
99

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