Предмет: Математика, автор: a71867154

5. Упростите выражение и найдите его значение: 1) 3(5-2x)+10х при х=0,2; 2) 4(0,7x+3)-5х при х=1,5; 3) 9(0,8-x)+2,8-3х при

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Автор ответа: prostokvashyno

0

Відповідь:1)3(5-2x)+10x ; х=0,2

3(5-0,4)+2

15-1,2+2=15,8

2)4(0,7х+3)-5х ; х=1,5

4(1,05+3)-7,5

4,2+12-7,5= 8,7

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