8/13÷7+1/7×6/131c,c+q-a3q:[3I2t6S
算式：提示7S;M1F)z)t9o-I1c,c+q-a3q:[3I2t6S
=8x+Q3V2e4o:Y'p-K9U1c,c+q-a3q:[3I2t6S