Tính: \(25-\left\{40:\left[\left(-2\right)^2+6\right]\right\}-\left(-18\right)\)
-7.39.23.-13.Hướng dẫn giải:\(25-\left\{40:\left[\left(-2\right)^2+6\right]\right\}-\left(-18\right)=25-\left[40:\left(4+6\right)\right]+18=25-\left(40:10\right)+18=25-4+18=21+18=39.\)