问题 解答题
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.
答案

(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.

单项选择题
问答题