Ответ учителя по предмету Математика
1)8,385 : x = 0,43
х=8,385:0,43
х=19,5
Проверка:
8,385:19,5=0,43
2)-3(2x + 3) -4(2 — 3x)=-6х-9-8+12х=6х-17
3)
3x — 15 = 5x + 13
3х-5х=13+15
-2х=28
х=28:(-2)
х=-14
4)
3(2x + 3) + 4(5 — x) = 43
6х+9+20-4х=43
2х=43-29
2х=14
х=14:2
х=7
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