口算. 4.2-3.7= 2.25+0.4= 7-6.4= 5.5+2.05= 6.5+2.9= 3.7-2.55= 2.83+1.6= 0.3-0.03= 1
口算.4.2-3.7=2.25+0.4=7-6.4=5.5+2.05=6.5+2.9=3.7-2.55=2.83+1.6=0.3-0.03=1.72+2.28=...
口算. 4.2-3.7= 2.25+0.4= 7-6.4= 5.5+2.05= 6.5+2.9= 3.7-2.55= 2.83+1.6= 0.3-0.03= 1.72+2.28=
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