Упростите выражение:
1) -1,6х*(-5у)=
2) -7а-9b+a+11b=
3) a-(a-8)+(12+a)=
4) -3(c-5)+6(c+3)=
HELP MEEEE!!!!!!!!!!
1) -1,6х*(-5у)=
2) -7а-9b+a+11b=
3) a-(a-8)+(12+a)=
4) -3(c-5)+6(c+3)=
HELP MEEEE!!!!!!!!!!
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Ответ:
1) - 1,6х*(-5у) = 8ху
2) - 7а-9b+a+11b= -6a +2b
3) a-(a-8) + (12 +a) = a-a+8+12+a=20+a
4) - 3 (c-5) + 6(c+3) = - 3c +15 + 6c +18 =3c+33