问题 解答题
脱式计算(能简算的要简算)
2.4×1.5+3.6×1.50.125×2.5×87.38-5.14+3.62-2.86
17.2-7.2×0.68.9×9.941.9-2.08-7.92.
答案

①2.4×1.5+3.6×1.5,

=1.5×(2.4+3.6),

=1.5×6,

=9;

②0.125×2.5×8,

=(0.125×8)×2.5,

=1×2.5,

=2.5;

③7.38-5.14+3.62-2.86,

=(7.38+3.62)-(2.86+5.14),

=11-8,

=3;

④17.2-7.2×0.6,

=17.2-4.32,

=12.88;

⑤8.9×9.9,

=8.9×(10-0.1),

=8.9×10-8.9×0.1,

=89-0.89,

=88.11;

⑥41.9-2.08-7.92,

=41.9-(2.08+7.92),

=41.9-10,

=31.9.

问答题 简答题
单项选择题