1. б. 907*576+907*144+907*9280=907*(576+144+9280)=907*10000=9070000
в. 345*111-279*111+134*111= 111*(345-279+134) = 111 * 200 =22200
2. (92а+16b-53c)*22=2024a+352b-1166
(7c+9+8d)*5+4*(5c-2-d) = 35c+45+40d+20c-8-4d = 55c-37+36d
(450x+7800y-40) : 10 = 45х + 780у - 4
3. 44х+25у+12х-13у=56х+12у
(18а+31b)-(9a-17b)=18a+31b-9a+17b= 9a+48b
48-39a-25a-41b-52b=48-64a-93b