Calculează: a) 195-6×[(4+2×13)-3×9+17];<br />
b) 5×(4+3×7)-2×{5+2×[10-3×(14-3×4)]};<br />
c) {30+10×[207-6×(28+28:7)]}:10-1;<br />
d) 300-6×[(2²+2×13)-3×3²+17]<br />
Pls dau corona e urgent am nevoie de ajutor