Question

1.5,8+х=2,61 2.- 6,4+(-7,8)-(-6,5)-1,7

Answer 1

$\\ \\ 1) \\ \\ 5.8 + x = 2.61 \\ \\ x = 2.61 - 5.8 \\ \\ x = - 3.19$

Проверка:

$\\ 5.8 +( - 3.19) = 2.61$

$2) \\ \\ - 6.4 + ( - 7.8 ) - ( - 6.5) - 1.7 = - 6.4 - 7.8 + 6.5 - 1.7 = - 15.9 + 6.5 = 9.4$

Answer 2

$5.8 + x = 2.61 \\ x = 2.61 - 5.8 \\ x = - 3.19 \\ \\ - 6.4 + ( - 7.8) - ( - 6.5) - 1.7 = - 6.4 - 7.8 + 6.5 - 1.7 = - 9.4$

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