(a1 + a2 + a3 + a4)*(b1 + b2 + b3 + b4)
$$\left(a_{1} + a_{2} + a_{3} + a_{4}\right) \left(b_{1} + b_{2} + b_{3} + b_{4}\right)$$
(a1 + a2 + a3 + a4)*(b1 + b2 + b3 + b4)
Рациональный знаменатель
[src](a1 + a2 + a3 + a4)*(b1 + b2 + b3 + b4)
$$\left(a_{1} + a_{2} + a_{3} + a_{4}\right) \left(b_{1} + b_{2} + b_{3} + b_{4}\right)$$
Объединение рациональных выражений
[src](a1 + a2 + a3 + a4)*(b1 + b2 + b3 + b4)
$$\left(a_{1} + a_{2} + a_{3} + a_{4}\right) \left(b_{1} + b_{2} + b_{3} + b_{4}\right)$$
(a1 + a2 + a3 + a4)*(b1 + b2 + b3 + b4)
$$\left(a_{1} + a_{2} + a_{3} + a_{4}\right) \left(b_{1} + b_{2} + b_{3} + b_{4}\right)$$
(a1 + a2 + a3 + a4)*(b1 + b2 + b3 + b4)
$$\left(a_{1} + a_{2} + a_{3} + a_{4}\right) \left(b_{1} + b_{2} + b_{3} + b_{4}\right)$$
(a1 + a2 + a3 + a4)*(b1 + b2 + b3 + b4)
$$\left(a_{1} + a_{2} + a_{3} + a_{4}\right) \left(b_{1} + b_{2} + b_{3} + b_{4}\right)$$
a1*b1 + a1*b2 + a1*b3 + a1*b4 + a2*b1 + a2*b2 + a2*b3 + a2*b4 + a3*b1 + a3*b2 + a3*b3 + a3*b4 + a4*b1 + a4*b2 + a4*b3 + a4*b4
$$a_{1} b_{1} + a_{1} b_{2} + a_{1} b_{3} + a_{1} b_{4} + a_{2} b_{1} + a_{2} b_{2} + a_{2} b_{3} + a_{2} b_{4} + a_{3} b_{1} + a_{3} b_{2} + a_{3} b_{3} + a_{3} b_{4} + a_{4} b_{1} + a_{4} b_{2} + a_{4} b_{3} + a_{4} b_{4}$$