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Calculează: a) [20 + 2x (110-20)]: 10+2×4= b) [72: (8x2-40:5)+91]: (7+3)= c) 200 + 30 x [9x (8+4): 4]-880:10= d) 16 x [40 + 2x (560: 8-7 x7)] x (10-100: 10) = 1000+8x [(56:7+12) x 101 - 2000]: 2 = เก 14 x 2:7) x 9] +5 x 20 =​