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计算下面各题(能简算的要简算)1.2×0.8×1.254.09÷2.5÷41.43×7.5+7.57×7.5+7.5.

题目详情
计算下面各题(能简算的要简算)
1.2×0.8×1.25 4.09÷2.5÷4 1.43×7.5+7.57×7.5+7.5.
▼优质解答
答案和解析
(1)1.2×0.8×1.25,
=1.2×(0.8×1.25),
=1.2×1,
=1.2;

(2)4.09÷2.5÷4,
=4.09÷(2.5×4),
=4.09÷10,
=0.409;

(3)1.43×7.5+7.57×7.5+7.5,
=7.5×(1.43+7.57+1),
=7.5×10,
=75.