东乡去年春季植树450棵,成活率为80%,去年秋季植树的成活率为90%,已知去年春季比秋季多死了18棵,这个乡去年一共种活了多少棵树?0_'E1Q0O7t6~(z5N7u.p*U(\7S
算式:提示:E-v9L(L5c;z0_'E1Q0O7t6~(z5N7u.p*U(\7S
答:这个乡去年一共种活了4q;X;g,v'_1v8d6c8V:F8f;k6u0s5Q棵树。0_'E1Q0O7t6~(z5N7u.p*U(\7S