The 21 part repeats
it can be represented as 21/99
it's rational
B1 to H1, B3 to H2, B2 to H3.
Answer:
Tổng 3 góc trong 1 tam giác là 180 độ
Vậy góc B = 180 - A - C = 180 - 90 - 50 = 40 độ
okay im not sure but maybe try to find a number that can be = to 18 and that might be y
Answer : x = 0,5,-2
Step 1 : factor left side
x(x+2)(x-5)=0
step 2 : set factors equal to 0
x=0, x+2=0 or, x-5=0
