①7.2÷[0.24×(18.8+31.2)]
②68.3×1.5﹣8.3×1.5
③12.7×99+12.7
④3.2×0.25×1.25
⑤82.74﹣(3.56+72.74)
⑥33.28﹣13.28÷8.3
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