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201226
@201226
July 2022
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Найдите значение выражения : а)81a+27b-(3a+b)+(-26b-78a) при а= -18 ,b=11
б)3(a-b)-5a+8b При : a=2 ,b= -3
в) 75-21(m+n)+7(3m+3n) При m=101 , n= -98
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ludmilaborisova
А) 81а+27b - (3a+b) +(-26b -78a)=81a+27b -3a -b -26b -78a = 0a + 0b = 0
b) 3(a -b) -5a+ 8b = 3a -3b -5a+8b = -2a+5b = -2 * 2+5 * (-3) = -4 -15 = -19
в) 75 -21(m+n)+7(3m+3n) = 75 -21m -21n +21m+21n = 75
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201226
а "б",точно правильное ,у меня подругому получилось...
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Answers & Comments
b) 3(a -b) -5a+ 8b = 3a -3b -5a+8b = -2a+5b = -2 * 2+5 * (-3) = -4 -15 = -19
в) 75 -21(m+n)+7(3m+3n) = 75 -21m -21n +21m+21n = 75