1.3x³=-81 2.x-121/49=0 求x的值
问题描述:
1.3x³=-81 2.x-121/49=0 求x的值
答
1.3x³=-81
x³=-27
x=-3
2.x²-121/49=0
x²=121/49
x=-11/7,x=11/7