来自权淑媛的问题
1:49.9²+9.98+0.1²2:99²+1991:(a+b)²+2(a+b)c+c²2:4a(a-b)+b²3:4xy²-4x²y-y³4:(4a²+1)²-16a²
1:49.9²+9.98+0.1²2:99²+199
1:(a+b)²+2(a+b)c+c²2:4a(a-b)+b²
3:4xy²-4x²y-y³4:(4a²+1)²-16a²
1回答
2020-03-22 13:45