Предмет: Математика, автор: DцP

1 вариант
1-2-3-5-6-7-задания

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Ответы

Автор ответа: nazzdan
0
1. 800:4=200
2. 40:42
3.21:6=3.5
3.5*8+28
ответ 28 г
5.х=0,25( 2х+1=3/2
2x=1/2
x=1/4=0,25
6. составим пропорцию: 240/252=100/x, по свойству пропорций х=(252*100)/240=105
105-100=5%
7.125
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