2.计算各题并验算3.64+0.48,21.56+6.74,7.85+9.19,41.2-15.6
2.计算各题并验算3.64+0.48,21.56+6.74,7.85+9.19,41.2-15.6,8.24-3.56...
2.计算各题并验算3.64+0.48,21.56+6.74,7.85+9.19,41.2-15.6,8.24-3.56
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3.64+0.48,
=4.12
验算
4.12-0.48=3.64
21.56+6.74,
=28.3
验算
28.3-21.56=6.74
7.85+9.19,
=17.04
验算
17.04-7.85=9.19
41.2-15.6
=25.6
验算
25.6+15.6
=41.2
=4.12
验算
4.12-0.48=3.64
21.56+6.74,
=28.3
验算
28.3-21.56=6.74
7.85+9.19,
=17.04
验算
17.04-7.85=9.19
41.2-15.6
=25.6
验算
25.6+15.6
=41.2
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