Помогите,пожалуйста 1. 0,4×(а-4)-0,3×(а-3)=1,7 2. (7а-2,8)×(4.9+3,5а)=0 3. (-2а+6,6)×(4,2а-8,4)=0. Created by viviq12338. algebra-ru

Помогите,пожалуйста 1. 0,4×(а-4)-0,3×(а-3)=1,7 2. (7а-2,8)×(4.9+3,5а)=0 3. (-2а+...

Fo4r 1)0,4а-1,6-0,3а-0,9=1,7
0,4а-0,3а=1,7+1,6+0,9
0,1а=......

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Хуqожнuк 1. 0,4 * (а - 4) - 0,3 * (а - 3) = 1,7
0.4a - 1.6 - 0.3a + 0.9 = 1.7
0.1a = 2.4
a = 24

2. (7a - 2,8) * (4.9 + 3,5a) = 0

7a - 2.8 = 0
4.9 + 3.5a = 0

a = 2.8/7
a = -4.9/3.5

a = 0.4
a = -1.4

2
3. (-2a + 6,6) * (4,2a - 8,4) = 0

-2a + 6.6 = 0
4.2a - 8.4 = 0

a = 6.6/2
a = 8.4/4.2

a = 3.3
a = 2

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