15-1(12÷4+1).
Calculate the contents of parentheses first, and do division first:
12÷4+1=3+1=4, so expression becomes:
15-1×4=15-4=11.
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15-1(12÷4+1).
Calculate the contents of parentheses first, and do division first:
12÷4+1=3+1=4, so expression becomes:
15-1×4=15-4=11.