84.2×1.27÷4.21 简便方法 3.69×31.5÷10.5 简便方法
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84.2×1.27÷4.21 简便方法 3.69×31.5÷10.5 简便方法
![84.2×1.27÷4.21 简便方法 3.69×31.5÷10.5 简便方法](/uploads/image/z/17212424-32-4.jpg?t=84.2%C3%971.27%C3%B74.21+%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95+3.69%C3%9731.5%C3%B710.5+%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95)
84.2×1.27÷4.21
=(84.2÷4.21)×1.27
=20×1.27
=25.4
3.69×31.5÷10.5
=3.69×(31.5÷10.5)
=3.69×3
=(3.7-0.01)×3
=3.7×3-0.01×3
=11.1-0.03
=11.07
=(84.2÷4.21)×1.27
=20×1.27
=25.4
3.69×31.5÷10.5
=3.69×(31.5÷10.5)
=3.69×3
=(3.7-0.01)×3
=3.7×3-0.01×3
=11.1-0.03
=11.07