这四题怎么巧算
2个回答
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解: 6.62+5.8-0.269
=12.42-0.269
=12.151
9/10+4.7-56/100
=0.9+4.7-0.56
=5.6-0.56
=5.04
87.41-(43.27-25.08)-9.92
=87.41-18.19-9.92
=69.22-9.92
=59.3
50.99-17.11+39.01-23.89
=(50.99+39.01)-(17.11+23.89)
=90-41
=49
=12.42-0.269
=12.151
9/10+4.7-56/100
=0.9+4.7-0.56
=5.6-0.56
=5.04
87.41-(43.27-25.08)-9.92
=87.41-18.19-9.92
=69.22-9.92
=59.3
50.99-17.11+39.01-23.89
=(50.99+39.01)-(17.11+23.89)
=90-41
=49
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