429:13-308:14+75=86
1610:23+56-1924:74=100
После примера
а) (х-8)=64*4
(х-8)=256
х=256+8
х=264
б) (х-8)=64/4
(х-8)=16
х=16+8
х=24
1.1. <span>1+(-2)+3+(-4)+5+(-6) = (1-2)+(3-4)+(5-6) = (-1)+(-1)+(-1) = (-1*3) = -3
1.2. </span>1+(-2)+3+(-4)+5+(-6)<span> = 1-2+3-4+5-6 = 1+3+5-2-4-6 = 9-12 = -3
2.1. </span>20+(-18)+16+(-14)+12+(-10) = (20-18)+(16-14)+(12-10) = 2+2+2 = 2*3 = 6
2.2. 2<span>0+(-18)+16+(-14)+12+(-10) = 20+16+12+(-18)+(-14)+(-10) = 48-42 = 6</span>
D * 70 = 49000
D = 49000 : 70
D = 700
Проверка:
700 * 70 = 50785 - 1785
49000 = 49000
......................................
K - 156 = 1880
K = 1880 + 156
K = 2036
Проверка:
2036 - 156 = 470 * 4
1880 = 1880