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+
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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+
)×(1-1 2
)×(1+1 2
)×(1-1 3
)×…×(1+1 3
)×(1-1 99
),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