Question

10-10÷{1+3•[(57-60÷4•2)÷3+21]÷10}=

Answer 1

10-10÷{1+3•[(57-60÷4•2)÷3+21]÷10}=
10-10÷{1+3•[(57-15•2)÷3+21]÷10}= 10-10÷{1+3•[(57-30)÷3+21]÷10}= 10-10÷{1+3•[27÷3+21]÷10}=10-10÷{1+3•[9+21]÷10}=10-10÷{1+3•30÷10}=10-10÷{1+90÷10}=10-10÷{1+9}=10-10÷10=10-1=9

Answer 2

10-10:{1+3·[(57-15·2):3+21]:10}=
10-10:{1+3·[(57-30):3+21]:10}=
10-10:[1+3·(27:3+21):10]=
10-10:[1+3·(9+21):10]=
10-10:(1+3·30:10)=
10-10:(1+9)=
10-10:10=
10-1= 9

/robèrtinni