问题
解答题
用简便方法计算(要写出主要的简算过程)
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答案
①15.07-2-14+3.86,
=(15.07+3.86)-(2+14),
=18.93-16,
=2.93;
②1.25×37×8×10,
=(1.25×8)×(37×10),
=10×370,
=370;
③999×99,
=×99,
=1000×99-99×1,
=99000-99,
=98901;
④360+702+360+360,
=360×3+702,
=1080+702,
=1782.