（2/7+5/7×4/5）÷2/3-N5H4j+Q3p:d7E/h)j2^+P7f
算式：提示6H;n8p:Y(b*N-N5H4j+Q3p:d7E/h)j2^+P7f
=*d2X({2D-N5H4j+Q3p:d7E/h)j2^+P7f