口算. 1÷ 1 5 = 1 3 4 +0.25 = 42× 1 7 = 0.5- 1 2
口算.1÷15=134+0.25=42×17=0.5-12=12-13=6×83=16×0×2=0÷38=0.125×8=...
口算. 1÷ 1 5 = 1 3 4 +0.25 = 42× 1 7 = 0.5- 1 2 = 1 2 - 1 3 = 6× 8 3 = 1 6 ×0×2 = 0÷ 3 8 = 0.125×8=
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