问题
解答题
用简便方法计算:
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答案
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.