Вычислить:
(657720 : 105 - (942690 : 201 + (168 : 28 - 4 × 863))) × 63
[Решение]
6264 - (4690 + (4704 + 3452)) × 37 = 6264 - (4690 + 8156) × 37 = 6264 - 12846 × 37 = 6264 - 475302 = - 469038.
Решить уравнение:
1) 900 - (14n + 8) : 20 = 894;
14n + 8
900 - 20 = 894;
2(7n + 4)
900 - 20 = 894;
7n + 4
900 - 10 = 894;
9000 - (7n + 4) = 8940;
9000 - 7n + 4 = 8940;
8996 - 7n = 8940;
-7n = 8940 - 8996;
-7n = -56;
n = 8.
2) ((12k - 4k - 98) : 2 + 56) × 36 - 268 = 2000;
((8k - 98) : 2 + 56 × 36 - 268 = 2000 ;
8k - 98
( 2 + 56) × 36 - 268 = 2000;
18(8k - 98) + 2016 - 268 = 2000;
144k - 1764 + 2016 = 2000;
144k - 16 = 2000;
144k = 2000 + 16;
144k = 2016;
144k = 14.
3) 1000 - 3 × (750 : 3x - 1) : 7 - 809 = 170;
1000 - 3(250x × 1) : 7 - 809 = 170;
3(250x - 1)
1000 - 7 - 809 = 170;
750x - 3
1000 - 7 - 809 = 170:
750x - 3
191 - 7 = 170;
1337 - (750x - 3) = 1190;
1337 - 750x - 3 = 1190;
1340 - 750x = 1190;
-750x = 1190 - 1340;
-750x = -150;
1
x= 5.
Упростить:
1) (30z × 44x × 10) : (22x × 15 × 2z) = (13200xz) : (660xz) = 20;
1
2) 2500xy : 50z : 25 : y = 2500xy : 50 × 1 × 25 =
1
50xy ×25 = 2xy;
3)
21x - 21
(25x - 13 - 9x + 5x - 8) : 21 = (21x - 21) : 21 = 21
21(x - 1)
= 21 ;
12 - 48x
4)(12 - 48x) : 6 + (85x - 7 - 13x - 11 : 9) = 6 +
11 6(2 - 8x) 5366
(-595 - 13x - 9 ) = 6 +( - 9 -13x) =
5366 5348
2 - 8x - 9 - 13x = - 9 -21x.
Задачки не смогу решить, надеюсь
