展开 (4,-1,-2)x(2,3,-6)

解答

展开

(4, - 1, - 2) x (2, 3, - 6)

4 x, 2, 3, - 4 x, 6 - 1 \cdot x, 2, 3, 1, 6 - 2 \cdot 2 x, 3, 2 \cdot 6

求解步骤

(4, - 1, - 2) x (2, 3, - 6)

= (4, - 1, - 2) (2 \cdot 3,, - 6) x

乘开

(4, - 1, - 2) (2, 3, - 6) : 4, 2, 3, - 4, 6 - 1, 2, 3, 1, 6 - 2 \cdot 2, 3, 2 \cdot 6

= x (4, 2, 3, - 4, 6 - 1, 2, 3, 1, 6 - 2 \cdot 2, 3, 2 \cdot 6)

乘开

x (4, 2, 3, - 4, 6 - 1, 2, 3, 1, 6 - 2 \cdot 2, 3, 2 \cdot 6) : 4 x, 2, 3, - 4 x, 6 - 1 \cdot x, 2, 3, 1, 6 - 2 \cdot 2 x, 3, 2 \cdot 6

= 4 x, 2, 3, - 4 x, 6 - 1 \cdot x, 2, 3, 1, 6 - 2 \cdot 2 x, 3, 2 \cdot 6

e x p an d (x^{2} + x y) d x + y^{2} d y

e x p an d \frac{6 ( x ^{2} + 4 x )}{( x + 2 ) ^{2}}

e x p an d \frac{( x - 9 ) ^{2}}{9}

e x p an d (2 x^{2} y + 2 x y + y^{3}) d x

e x p an d (x = 2, y + 15) (2 x + 3 y = 2)