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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.

题目详情
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.
▼优质解答
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.