问题
解答题
用你喜欢的方法计算
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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.