Вопрос школьника по предмету Математика
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Найти значение выражения 15х+4у-7х+8у, если число х составляет 20% от числа 4, а y составляет 15% от числа 4,5.
Ответ учителя по предмету Математика
x=4*0,2=0,8
y=4,5*0,15=0,675
15*0,8+4*0,675-7*0,8+8*0,675=12+2,7-5,6+5,4=14,5
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