下列各式的计算中不正确的个数是①100÷10﹣1=10；②10﹣4（2×7）0=1000；③（﹣0.1）0÷（﹣2﹣1）﹣3=8；④（﹣10）﹣4÷（﹣10﹣1）﹣4=﹣1[]A．4个B．3个C．2个

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