6)She...French well(not/to speak) 7)My working day...at seven o clock (to begin) 8)I...up...on the radio - id1556893720221006 от Arisha12205 06.10.2022 10:21

Question

Алгебра: 6)She...French well(not/to speak) 7)My working day...at seven o clock (to begin) 8)I...up...on the radio and...my morning exercises (ti get) (to switch) (to do) 9)it...me fifteen minutes (to take) 10)...your teacher...home at eight o clock (to leave) 11)...your...a bus to his factory? (

Arisha12205 · Accepted Answer

1) путь сначала было х соли и у воды
x/(x+y)=0,35
x+y -масса раствора
когда добавили соль, стало
(x+110)/(x+110+y)=0,6
решаем эту систему
x=0,35(x+y)
x+110=0,6(x+y+110)

x=0,35x+0,35y
0,65x=0,35y
y=0,65x/0,35=13x/7

x+110=0,6(x+13x/7+110)
x+110=0,6(20x/7+110)
x+110=12x/7+66
12x/7-x=110-66
4x/7=44
x=44*7/4=77
y=77 *13/7=11*13=143
x+y=77+143=220
ответ: первоначальная масса раствора 220г
в растворе первоначально было соли 77г

2) в певой бочке было х литров, а во второй у
x+y=798
x-15=y-57
решаем эту систему
y=798-x
x=y-42
x=798-x-42
2x=756
x=378
y=798-378=420

ответ: в первой бочке было первоначально 378л бензина;
во второй бочке было первоначально 420л бензина.

6)She...French well(not/to speak) 7)My working day...at seven o'clock (to begin)
8)I...up...on the radio and...my morning exercises (ti get) (to switch) (to do)
9)it...me fifteen minutes (to take)
10)...your teacher...home at eight o'clock (to leave)
11)...your...a bus to his factory? (

MOGZ ответил

6)She...French well(not/to speak) 7)My working day...at seven o'clock (to begin) 8)I...up...on the radio and...my morning exercises (ti get) (to switch) (to do) 9)it...me fifteen minutes (to take) 10)...your teacher...home at eight o'clock (to leave) 11)...your...a bus to his factory? (

MOGZ ответил

6)She...French well(not/to speak) 7)My working day...at seven o'clock (to begin)
8)I...up...on the radio and...my morning exercises (ti get) (to switch) (to do)
9)it...me fifteen minutes (to take)
10)...your teacher...home at eight o'clock (to leave)
11)...your...a bus to his factory? (