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b. (3√81 - √25) : ( - 11) = ( 3 · 9 - 5) : ( - 11) = (27 - 5) : ( -11) = 22 ; ( -11) = - 2
c. rad( √144 : ( - √9) + 20 ) = rad( 12 : ( -3) + 20 ) = rad( -4 + 20 ) = √16 = 4
d. rad((√100 + √64) :2 = rad( ( 10 + 8 ) :2 = rad( 18 :2) = √9 = 3
e . [√( -2)⁴ - √324 ] : ( - 7) + 2 = [ √16 - 18 ] : ( -7) + 2 = [ 4 - 18]:(- 7) +2=
= -14 : ( - 7) + 2 = 2 +2 = 4
f. rad[ √81 - (13 - 5) ] = rad [ 9 - 8 ] = √1 =1
4a+6=222
4a=216
a=54
54+55+56+57=222