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口算． 1500+800= 430+80= 960-400= 3000-1300= 5 9 - 2 9 = 1- 3 9 = 3+8×6= 44÷6= 300×8= 36÷4= 231×3= 3÷3= 50÷7= 320×0= 9×7-7= 0×8+4= 2000×4= 705×5= 26÷8= 470-280=
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