Сторона квадрата = 48 : 4 =12
Площадь = 12 * 12 = 144 мм^2
Ответ: 144 мм^2
1.Найдите значение выражения:
А) - (1 - x) - (5,1 + x) =-1+х-5,1-х=-6,1;////
B) - (a - x - 3) - (x - a + 2) =
-а+х+3-х+а-2=1;////
C) (a + 3,3 - a) - (3,3 + x) =
а+3,3-а-3,3-х=-х;////
D) - (2,43 + x - b) - (2,43 + b - x) =
-2,43-х+b-2,43-b+x=-4,86;///
E) - (1,53 - x + 1) - (x - a - 2,53) =
-1,53+х-1-х+а+2,53=а
2.Упрости выражение и подчеркни коэффициент.
А) 3,1a • 0,3c =0,93ас;///
B) 4,5b • 0,04a =0,18аb;///
C) 3,8a • 1,2b =4,56ab;///
D) 2,8a • ( - 1,05c) =-2,94ac;////
E) 7,2c • 0.35b =2,52cb;////
3. Найдите значение выражения:
А 3,1x - 0,3x + 2,2x - 4x =x;////
B 4,5a - 0,04a + 3,07a - 7,53a =0;////
C - (3,3a + 1,2b) - (0,7b + 1,7a) - (1,1b - 5a)
=-3,3a-1,2b-0,7b-1,7a-1,1b+5a=-3b;////
D (4,7a + 2,2c) • ( - 2) - (9,6a - 4,4c) =
-9,4a-4,4c-9,6a+4,4c=-19;///
E 7,2 • (x + c) - (1,1x - 3,6c) • ( - 2) =
7,2х+7,2с-(-2,2х+7,2с)=
7,2х+7,2с+2,2х-7,2с=9,4х
1) 1= 83/83
1) 1 - 9/83 = 83-9/83 = 74/83
2) 1 - 63/83 = 83-63/83 = 20/83
3) 1 - 70/83 = 83-70/83 = 13/83
4) 74/83 - 20/83 = 74-20/83 = 54/83
5) 54/83 - 13/83 = 54-13/83 = 41/83
2) 1= 91/91
1) 1 - 87/91 = 91-87/91 = 4/91
2) 1 - 25/91 = 91-25/91 = 66/91
3) 1 - 80/91 = 91-80/91 = 11/91
4) 4/91 + 66/91 = 4+66/91 = 70/91
5) 70/91 - 11/91 = 70-11/91 = 59/91
3) 1= 71/71
1) 1 - 11/71 = 71-11/71 = 60/71
2) 1 - 50/71 = 71-50/71 = 21/71
3) 1 - 59/71 = 71-59/71 = 12/71
4) 60/71 - 21/71 = 60-21/71 = 39/71
5) 39/71 + 12/71 = 39+12/71 = 51/71
4) 1= 63/63
1) 1 - 19/63 = 63-19/63 = 44/63
2) 1 - 55/63 = 63-55/63 = 8/63
3) 1 - 61/63 = 63-61/63 = 2/63
4) 44/63 - 8/63 = 44-8/63 = 36/63
5) 36/63 - 2/63 = 36-2/63 = 34/63