Tính giá trị các biểu thức

a) 142 - [ 50 - ( 2³ x 10³ x 5³ ) ]

First, we need to simplify the expression inside the innermost parentheses:
2³ = 8
10³ = 1000
5³ = 125

So, the expression becomes:
142 - [ 50 - ( 8 x 1000 x 125 ) ]

Next, we simplify the expression inside the second set of parentheses:
8 x 1000 x 125 = 1,000,000

So, the expression becomes:
142 - [ 50 - 1,000,000 ]

Now, we simplify the expression inside the outermost parentheses:
50 - 1,000,000 = -999,950

Finally, we substitute this value back into the original expression:
142 - (-999,950) = 142 + 999,950 = 1,000,092

Therefore, the value of the expression is 1,000,092.

b) 80 - [ 130 - ( 12 - 4³ ) ]

First, we need to simplify the expression inside the innermost parentheses:
4³ = 64

So, the expression becomes:
80 - [ 130 - ( 12 - 64 ) ]

Next, we simplify the expression inside the second set of parentheses:
12 - 64 = -52

So, the expression becomes:
80 - [ 130 - (-52) ]

Now, we simplify the expression inside the outermost parentheses:
130 - (-52) = 130 + 52 = 182

Finally, we substitute this value back into the original expression:
80 - 182 = -102

Therefore, the value of the expression is -102.