(1)计算：$-1^{4}+(-3)^{2}\text{×}(-\dfrac{2}{3})-4^{2}\text{÷|-}4\text{|}$； (2)先化简，再求值：$3m^{2}n-\text{[}mn^{2}-\dfrac{1}{2}(4mn^{2}-6m^{2}n)+m^{2}n\text{]+}4mn^{2}$，其中$m\text{=-}2$，$n=3.$

1. 计算乘方与绝对值

$-1^{4}+(-3)^{2}\times(-\dfrac{2}{3})-4^{2}\div|-4| = -1 + 9 \times (-\dfrac{2}{3}) - 16 \div 4$

2. 进行乘除运算

$-1 + 9 \times (-\dfrac{2}{3}) - 16 \div 4 = -1 + (-6) - 4$

3. 进行加减运算得出最终结果

$-1 + (-6) - 4 = -11$

1. 去小括号，并合并中括号内的同类项

$3m^{2}n-[mn^{2}-\dfrac{1}{2}(4mn^{2}-6m^{2}n)+m^{2}n]+4mn^{2} = 3m^{2}n-[mn^{2}-2mn^{2}+3m^{2}n+m^{2}n]+4mn^{2} = 3m^{2}n-[-mn^{2}+4m^{2}n]+4mn^{2}$

2. 去中括号并合并同类项完成化简

$3m^{2}n-[-mn^{2}+4m^{2}n]+4mn^{2} = 3m^{2}n+mn^{2}-4m^{2}n+4mn^{2} = -m^{2}n+5mn^{2}$

3. 将变量的值代入化简后的代数式中计算

当 $m=-2$，$n=3$ 时，
原式 $=-(-2)^{2}\times 3+5\times(-2)\times 3^{2} = -4\times 3+5\times(-2)\times 9 = -12-90 = -102$