用简便的方法计算,C4~3l8?1}
1.86×7.2-1.86×2.2,C4~3l8?1}
算式:提示+a8`;l5u;T,j+?6[,i(f0K,C4~3l8?1}
=:z7l-u1t,C4~3l8?1}