Question

True or false : 20÷4x5= 1 10+10÷2=15 6+4×5=50 12_3×2=6 81÷9+2=11

Answer 1

False
True
False
True......
( i wish it helps.....)

Answer 2

To solve, you must use order of operations. The acronym used is BEDMAS (brackets, exponents, division/multiplication, addition/subtraction), which is the order you solve in. 

F  20÷4x5
    =5x5
    =25
      
T   10+10÷2
      =10+5
      =15

F    6+4×5
      =6+20
      =26

T   81÷9+2
     =9+2
     =11