求解,小学五年级华数:小数的巧算与估算,写在纸上发图片,谢谢!!!_百 ...

发布网友发布时间：2024-10-21 23:10

共1个回答

热心网友时间：1天前

=3.15X(2.17+5.61+6.6)+(2.17+5.61)X(2.17+5.61+6.6)-[3.15X(2.17+5.61)+(2.17+5.61+6.6)X(2.17+5.61)]
=3.15X(2.17+5.61)+3.15X6.6+(2.17+5.61)X(2.17+5.61+6.6)-3.15X(2.17+5.61)-(2.17+5.61+6.6)X(2.17+5.61)
=3.15X(2.17+5.61)-3.15X(2.17+5.61)+[(2.17+5.61)X(2.17+5.61+6.6)-(2.17+5.61+6.6)X(2.17+5.61)]+3.15X6.6
=0+0+20.79
=20.79
第4题：≈5.4X0.6≈3.2

热心网友时间：1天前

=3.15X(2.17+5.61+6.6)+(2.17+5.61)X(2.17+5.61+6.6)-[3.15X(2.17+5.61)+(2.17+5.61+6.6)X(2.17+5.61)]
=3.15X(2.17+5.61)+3.15X6.6+(2.17+5.61)X(2.17+5.61+6.6)-3.15X(2.17+5.61)-(2.17+5.61+6.6)X(2.17+5.61)
=3.15X(2.17+5.61)-3.15X(2.17+5.61)+[(2.17+5.61)X(2.17+5.61+6.6)-(2.17+5.61+6.6)X(2.17+5.61)]+3.15X6.6
=0+0+20.79
=20.79
第4题：≈5.4X0.6≈3.2

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