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计算.(能简算的要简算)70-29.6-10.4;25×33×4×2;283×5+17×5;2.6×78+78×7.4.
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计算.(能简算的要简算) 70-29.6-10.4; | 25×33×4×2; | 283×5+17×5; | 2.6×78+78×7.4. |
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答案和解析
(1)70-29.6-10.4,
=70-(29.6+10.4),
=70-40,
=30;
(2)25×33×4×2,
=25×4×(33×2),
=100×66,
=6600;
(3)283×5+17×5,
=(283+17)×5,
=300×5,
=1500;
(4)2.6×78+78×7.4,
=(2.6+7.4)×78,
=10×78,
=780.
=70-(29.6+10.4),
=70-40,
=30;
(2)25×33×4×2,
=25×4×(33×2),
=100×66,
=6600;
(3)283×5+17×5,
=(283+17)×5,
=300×5,
=1500;
(4)2.6×78+78×7.4,
=(2.6+7.4)×78,
=10×78,
=780.
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