用简便方法计算:①9.6×10.1=②12.5×3.7×0.8=③1.2×2.5+0.8×2.5=④4.8×0.25=⑤99×0.6=⑥2.6×1.25-1.6×1.
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解决时间 2021-01-04 13:48
- 提问者网友:欺烟
- 2021-01-03 23:05
用简便方法计算:①9.6×10.1=②12.5×3.7×0.8=③1.2×2.5+0.8×2.5=④4.8×0.25=⑤99×0.6=⑥2.6×1.25-1.6×1.25=
最佳答案
- 五星知识达人网友:第四晚心情
- 2021-01-03 23:28
解:①9.6×10.1,
=9.6×(10+0.1),
=9.6×10+9.6×0.1,
=96+0.96,
=96.96;
②12.5×3.7×0.8,
=12.5×0.8×3.7,
=10×3.7,
=37;
③1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;
④4.8×0.25,
=1.2×4×0.25,
=1.2×(4×0.25),
=1.2×1,
=1.2;
⑤99×0.6,
=(100-1)×0.6,
=100×0.6-0.6,
=60-0.6,
=59.4;
⑥2.6×1.25-1.6×1.25,
=(2.6-1.6)×1.25,
=1×1.25,
=1.25.解析分析:①把10.1看作10+0.1,运用乘法分配律简算;②运用乘法交换律简算;③运用乘法分配律简算;④把4.8看作1.2×4,运用乘法结合律简算;⑤把99看作100-1,运用乘法分配律简算;⑥运用乘法分配律简算.点评:完成本题要注意分析式中数据,有的要通过数字拆分,运用合适的简便方法计算.
=9.6×(10+0.1),
=9.6×10+9.6×0.1,
=96+0.96,
=96.96;
②12.5×3.7×0.8,
=12.5×0.8×3.7,
=10×3.7,
=37;
③1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;
④4.8×0.25,
=1.2×4×0.25,
=1.2×(4×0.25),
=1.2×1,
=1.2;
⑤99×0.6,
=(100-1)×0.6,
=100×0.6-0.6,
=60-0.6,
=59.4;
⑥2.6×1.25-1.6×1.25,
=(2.6-1.6)×1.25,
=1×1.25,
=1.25.解析分析:①把10.1看作10+0.1,运用乘法分配律简算;②运用乘法交换律简算;③运用乘法分配律简算;④把4.8看作1.2×4,运用乘法结合律简算;⑤把99看作100-1,运用乘法分配律简算;⑥运用乘法分配律简算.点评:完成本题要注意分析式中数据,有的要通过数字拆分,运用合适的简便方法计算.
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- 1楼网友:荒野風
- 2021-01-03 23:49
谢谢回答!!!
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