решите уравнение: г) (38+b)×12=840 д)14(p-30)=630 e) (43-s)×17=289. Created by GGInext. matematika-ru

решите уравнение: г) (38+b)×12=840 д)14(p-30)=630 e) (43-s)×17=289...

tooblebooble

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Г) 840=12(38+b)
70=38+b
b=70-38
b=32
д) 630=14(р-30)
45=р-30
р=75
е) 289=17(43-s)
17=43-s
s=26

105 votes Thanks 132

Zlataya

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Уравнение г
(38 + b) ∙12 = 840
38 + b =840 : 12
38 + b = 70
b = 70 – 38
b = 32
Проверка: (38 + 32) · 12 = 840
Уравнение д
14 ∙ (p –30) = 630
p – 30 =630 : 14
p – 30 = 45
p = 45 + 30
p = 75
Проверка: 14 · (75 - 30) = 630
Уравнение е
(43 – s) ∙17 = 289
43 – s =289 : 17
43 – s = 17
s = 43 – 17
s = 26
Проверка: (43 - 26) · 17 = 289

119 votes Thanks 222

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