2/5×3/4+0.25×2/5:L'e2w'P'x5w2B1K)y,]'t-`'b2L;R-E8I
算式：提示3q+D+J*\'Q:L'e2w'P'x5w2B1K)y,]'t-`'b2L;R-E8I
=(V5b9V'f-_*H(Q:q8j,L6z:L'e2w'P'x5w2B1K)y,]'t-`'b2L;R-E8I