Question

{1+2×[3+4×(5×6+7)]}:3-100

Answer 1

$\displaystyle \{1+2 \times[3+4 \times(5 \times 6+7)]\}:3-100= \\ =\{1+2 \times[3+4 \times(30+7)]\}:3-100= \\ =[1+2 \times (3+4 \times 37)]:3-100= \\ =[1+2 \times (3+148)]:3-100= \\ =(1+2 \times 151):3-100= \\ =(1+302):3-100= \\ =303:3-100= \\ =101-100= \\ =1$