1:
2.78+0.8+0.2
=2.78+﹙0.8+0.2﹚
=2.78+1
=3.78
0.37+1.79+0.63
=0.37+0.63+1.79
=1+1.79
=2.79
2:
17.4+18.8+18.6+17.2
=﹙17.4+18.6﹚+﹙18.8+17.2﹚
=36+36
=72秒
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