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export function SqrtNumber(x: number, delta: number = Number.EPSILON): number {    if (x < 0) {        throw Error("should greater than 0:" + x);    }    if (x === 0) {        return 0;    }    if (x === 1) {        return 1;    }    let y = x;    let z = x;    while (z == x || Math.abs(z - y) > delta) {        z = y;        y = (x + y * y) / 2 / y;    }    return Math.abs(y);}