Вопрос школьника по предмету Математика
Упрастите выражение.
1)-1,6x*(-5y)
2)-7a-9d+a+11b
3) a- (-a-8)+(12+a)
4) -3 (c-5)+6 (c+3)
Ответ учителя по предмету Математика
1) -1,6х*(-5у)=8ху
2)-7а-9d+а+11b=-6а-9d+11b
3)a-(-a-8)+(12+a)=a+a+8+12+a=3a+20
4)-3(c-5)+6(c+3)=-3c+15+6c+18=3c+33=3(c+11)
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