2960 902800:305=2960
305
-------
1480
888
-------------
902800
1тонна=1000кг 5т9кг=5009кг ответ 3
№1
5.6\1.9-7.5= 5.6\-5.6=-1
2\3+5\7 \ 6\11+8\77=(14\21+15\21)\ (6*7\77-8\77)=29\21 \ 34\77 =29*77\21*34=319\102=3 13\102
№2
-х+4-(5+х)=-1-х
-х+4-5-х=-1-х
-2х-1=-1-х
-2х+х=-1+1
-х=0
-3-х=4х+7
-х-4х=7+3
-5х=10
х=10:(-5)
х=-2
№3
13\5=2.6 21\25=0.84 101\4=25,25
(2+5i)•(-3+4i)=-6-15і+8і+20і²=20і²-7і-6
Ответ:
Пошаговое объяснение:
5 + 2/3 * (-2 1/2) = 5 - 5/3 = 10/3 = 3 1/3
-2 : 5 1/3 - 7/10 : 1 1/15 = -2 : 16/3 - 7/10 : 16/15 = -2 * 3/16 - 7/10 * 15/16 = -3/8 - 21/32 = -33/32 = -1 1/32
2 1/5 * 1/3 + (-3/10) : 4 1/2 = 11/5 * 1/3 + (-3/10) : 9/2 = 11/15 - 1/15 = 10/15 = 2/3
3/7 - (1 1/4 - 1 1/8 * 2/9) = 3/7 - (5/4 - 9/8 * 2/9) = 3/7 - (5/4 - 1/4) = 3/7 - 1 = - 4/7