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3.
Найдите значение выражения:
(-0,82-0,88):(-3,4)+1,6*(-0,4)
4.
Упростите выражение-4(3,5x-4)-(7-2,1x)+5(0,3x-5) и вычислите его значение при x=-10/27
5.
Чему равно значение выражения
1,7x-(0,2x+2y),если 4y-3x=6?-
Предмет:
Математика -
Автор:
caponese9k - 6 лет назад
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Ответы 1
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Автор:
finn155 - 6 лет назад
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0
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имеется 2 сосуда. первый содержит 75 кг, а второй 10 кг раствора кислоты различной концентрации. если эти растворы смешать, то получится раствор, содержащий 20% кислоты. если же смешать равные массы этих растворов, то получится раствор, содержащий 46% кислоты. сколько кг кислоты содержится в первом сосуде?
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