问题 解答题
能简便计算的要简便
①35.7-8.9-11.1+3.3
②4.6÷2.5÷0.4
③2.7×9.9④2.56×1.7+1.44×1.7
⑤(1-0.2)×[13-(3.12+5.28)].
答案

①35.7-8.9-11.1+3.3,

=35.7+3.3-(8.9+11.1),

=39-20,

=19;

②4.6÷2.5÷0.4,

=4.6÷(2.5×0.4),

=4.6÷1,

=4.6;

③2.7×9.9,

=2.7×(10-0.1),

=2.7×10-2.7×0.1,

=27-0.27,

=26.73;

④2.56×1.7+1.44×1.7,

=1.7×(2.56+1.44),

=1.7×4,

=6.8;

⑤(1-0.2)×[13-(3.12+5.28)],

=0.8×[13-8.4],

=0.8×4.6,

=3.68.

单项选择题
单项选择题 A1/A2型题