求下列各式的未知数x,1.x²=9分之25,2.(x-3)²=144 3.4(x-3)²=9
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![求下列各式的未知数x,1.x²=9分之25,2.(x-3)²=144 3.4(x-3)²=9](/uploads/image/z/1545529-49-9.jpg?t=%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E6%9C%AA%E7%9F%A5%E6%95%B0x%2C1.x%26%23178%3B%3D9%E5%88%86%E4%B9%8B25%2C2.%EF%BC%88x-3%EF%BC%89%26%23178%3B%3D144+3.4%EF%BC%88x-3%29%26%23178%3B%3D9)
求下列各式的未知数x,1.x²=9分之25,2.(x-3)²=144 3.4(x-3)²=9
求下列各式的未知数x,1.x²=9分之25,2.(x-3)²=144 3.4(x-3)²=9
求下列各式的未知数x,1.x²=9分之25,2.(x-3)²=144 3.4(x-3)²=9
1.x²=9分之25,
x=±3/5 即:x1=3/5 x2=-3/5
2.(x-3)²=144
x-3=±12
即:x1=12+3=15 x2=3-12=-9
3.4(x-3)²=9
2(x-3)=±3
2x-6=±3
x1=(3+6)/2=9/2 x2=(-3+6)/2=3/2