问题 解答题
用你喜欢的方法计算
①99×11②23×45+23×55③(105×12-635)÷25
④44×25⑤25×18×4⑥864÷[(27-23)×12].
答案

①99×11,

=(100-1)×11,

=100×11-11,

=1100-10-1,

=1090-1,

=1089;

②23×45+23×55,

=23×(45+55),

=23×100,

=2300;

③(105×12-635)÷25,

=(1260-635)÷25,

=625÷25,

=25;

④44×25,

=(40+4)×25,

=40×25+4×25,

=1000+100,

=1100;

⑤25×18×4,

=(25×4)×18,

=100×18,

=1800;

⑥864÷[(27-23)×12],

=864÷[4×12],

=864÷48,

=18.

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