104.
1) 37*218+63*218 = 218*(37+63) = 218*100 = 21800
2) 568*43-566*43 = 43*(568-566) = 53*2 = 106
3) 417*187+417*213 = 417*(187+213) = 417*400 = 166800
4) 52*187-52*43-52*44 = 52*(187-43-44) = 52*100 = 5200
105.
1) 359*a+641*17 при a=17
359*17+641*17 = 17*(359+641) = 17*1000 = 17000
2) 769*87-87b при b=369
769*87-87*369 = 87*(769-369) = 87*400 = 34800
106.
1) 5x+7x = 12x
2) 17a-9a = 8a
3) 34a-a = 33a
4) c+72c = 73c
5) 7x+8x+12c = 15x+12c
6) 53y+18y-24y = 47y
7) 14m+15m+16 = 29m+16
8) 69n-n-18 = 68n-18
9) 25x+37x-17x-x = 44x
107.
1) 37a+83a = 120a при а=8
120*8 = 960
2) 82b-28b = 54b при b=32
54*32 = 1728
3) 33c-6c-7c = 20c при c=549
20*549 = 10980
4) 17x-8x+23x-18 = 32x-18 при x=312
32*312-18 = 9966
108.
1) 2491:53 = 47
2) 5698:14 = 407
3) 9792:32 = 306
4) 23655:57 = 415
а) 18³-7³/18²+18*7+7²=(18-7)*(18²+18*7+7²)/18²+18*7+7²=18-7=11
б) 783³+517³/(783-517)²+783*517=783³+517³/783²-783*517+517²=(783+517)*(783²-783*517+517²)/783²-783*517+517²=783+517=1300
в) 2,5³-4,4³/1,9+2,5²+4,4²=(2,5-4,4)*(2,5²+2,5*4,4+4,4²)/1,9 +2,5²+4,4²=-1,9*(2,5²+2,5*4,4+4,4²)/1,9 +2,5²+4,4²=-(2,5²+2,5*4,4+4,4²)/1,9 +2,5²+4,4²=-2,5²-2,5*4,4-4,4²+2,5²+4,4²=-2,5*4,4=-11