a)
a = ( -2 ) ³ [ -⅔ × 3² : √₆₄ - 4/3 × (- ⅜ ) ] =
(-8)*[-⅔*9:8-4/3*(-⅜)] = (-8)*[-6:8+½ ] = (-8)*[-¾+½] = (-8)*[-¾+2/4] = (-8)*[-¼] = 2
0,33*2 = 0,66
b )
[(11/5 + 0,4 ) : ½ - 2⅖ ] × 7 ½ = [(2,2+0,4)*2-12/5]*7,5 = [2,6*2-2,4]*7,5 = [5,2-2,4]*7,5 = 2,8*7,5 = 21
350% - 21
100% - x
350x=2100 /:350
x=6
