(1) 17-8÷(-2)+4×(-3) (2) 1-25÷5/6×(-1/10) (3)18-6÷(-2)×(-1/3) (4)6÷(1/2-1/3) (5)11/5×(1/3-1/2)×3/11÷5/4 (6)2又1/4×(-6/7)÷(1/2-2) (7)-2×3²- (-2×3²)
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