Question

Срочно мне надо дам 30 балов

Answer 1

А. сумма

$(3 {a}^{3} b - 2 {a}^{2} {b}^{2} + 7 {a}^{2} b - 8b - 11) + (6 {a}^{3} b - 3 {a}^{2} {b}^{2} - 7ab - 4b - 13) = 3 {a}^{3} b - 2 {a}^{2} {b}^{2} + 7 {a}^{2} b - 8b - 11 + 6 {a}^{3} b - 3 {a}^{2} {b}^{2} - 7ab - 4b - 13 = (3 {a}^{3} b + 6 {a}^{3} b) + ( - 2 {a}^{2} {b}^{2} - 3 {a}^{2} {b}^{2} ) + (7 {a}^{2} b) + ( - 7ab) + ( - 8b - 4b) + ( - 11 - 13) = 9 {a}^{3} - 5 {a}^{2} {b}^{2} + 7 {a}^{2} - 7ab - 12b - 24$

А. разность

$(3 {a}^{3} b - 2 {a}^{2} {b}^{2} + 7 {a}^{2} b - 8b - 11) - (6 {a}^{3} b - 3 {a}^{2} {b}^{2} - 7ab - 4b - 13) = 3 {a}^{3} b - 2 {a}^{2} {b}^{2} + 7 {a}^{2} b - 8b - 11 - 6 {a}^{3} b + 3 {a}^{2} {b}^{2} + 7ab + 4b + 13 = (3 {a}^{3}b - 6 {a}^{3} b) + ( - 2 {a}^{2} {b}^{2} + 3 {a}^{2} {b}^{2} ) + (7 {a}^{2} b) + (7ab) + ( - 8b + 4b) + ( - 11 + 13) = - 3 {a}^{3} b + {a}^{2} {b}^{2} + 7 {a}^{2} b + 7ab - 4b + 2$

Б. сумма

$(19 {x}^{5} - 18 {x}^{4} + 13 {x}^{3} - 5x + 3) + (20 {x}^{5} - 13 {x}^{4} - 15 {x}^{3} - 5 {x}^{2} - 3) = 19 {x}^{5} - 18 {x}^{4} + 13 {x}^{3} - 5x + 3+ 20 {x}^{5} - 13 {x}^{4} - 15 {x}^{3} - 5 {x}^{2} - 3= (19 {x}^{5} + 20 {x}^{5} ) + ( - 18 {x}^{4} - 13 {x}^{4} ) + (13 {x}^{3} - 15 {x}^{3} ) + ( - 5 {x}^{2} ) + ( - 5x)+ (3 - 3) = 39 {x}^{5} - 31 {x}^{4} - 2 {x}^{3} - 5 {x}^{2} - 5x$

Б. разность

$(19 {x}^{5} - 18 {x}^{4} + 13 {x}^{3} - 5x + 3) - (20 {x}^{5} - 13 {x}^{4} - 15 {x}^{3} - 5 {x}^{2} - 3) = 19 {x}^{5} - 18 {x}^{4} + 13 {x}^{3} - 5x + 3 - 20 {x}^{5} + 13 {x}^{4} + 15 {x}^{3} + 5 {x}^{2} + 3= (19 {x}^{5} - 20 {x}^{5} ) + ( - 18 {x}^{4} + 13 {x}^{4} ) + (13 {x}^{3} + 15 {x}^{3} ) + ( 5 {x}^{2} ) + ( - 5x)+ (3 + 3) = - {x}^{5} - 5 {x}^{4} + 28 {x}^{3} + 5 {x}^{2} - 5x + 6$

В. сумма

$(2 {x}^{3} - 1.7 {x}^{2} y - 5.4x {y}^{2} - 3.3 {y}^{3} ) + ( - 0.3 {x}^{3} - 0.07 {x}^{2} y - 5.4x {y}^{2} - 3.03 {y}^{3} ) = 2 {x}^{3} - 1.7 {x}^{2} y - 5.4x {y}^{2} - 3.3 {y}^{3} - 0.3 {x}^{3} - 0.07 {x}^{2} y - 5.4x {y}^{2} - 3.03 {y}^{3} = (2 {x}^{3} - 0.3 {x}^{3} ) + ( - 1.7 {x}^{2} y - 0.07 {x}^{2} y) + ( - 5.4x {y}^{2} - 5.4x {y}^{2} ) + ( - 3.3 {y}^{3} - 3.03 {y}^{3} ) = 1.7 {x}^{3} - 1.77 {x}^{2} y - 10.8x {y}^{2} - 0.27 {y}^{3}$

В. разность

$(2 {x}^{3} - 1.7 {x}^{2} y - 5.4x {y}^{2} - 3.3 {y}^{3} ) - ( - 0.3 {x}^{3} - 0.07 {x}^{2} y - 5.4x {y}^{2} - 3.03 {y}^{3} ) = 2 {x}^{3} - 1.7 {x}^{2} y - 5.4x {y}^{2} - 3.3 {y}^{3} + 0.3 {x}^{3} + 0.07 {x}^{2} y + 5.4x {y}^{2} + 3.03 {y}^{3} = (2 {x}^{3} + 0.3 {x}^{3} ) + ( - 1.7 {x}^{2} y + 0.07 {x}^{2} y) + ( - 5.4x {y}^{2} + 5.4x {y}^{2} ) + ( - 3.3 {y}^{3} + 3.03 {y}^{3} ) = 2.3 {x}^{3} - 1.63 {x}^{2} y - 0.27 {y}^{3}$