Запиши сумму и разность двух выражений и упрости их: 1) 5n+1 и -6-3n-4 2) 1.3n - 6 и -3n-8n 3) -16 +21 и-3.5+n-2n 4)-8+16.2 и a-3a+1.5a
Answers & Comments
oliklevoshko
1) a. (5n+1)+(-6-3n-4)=5n+1-6-3n-4=2n-9 b. (5n+1)-(-6-3n-4)=5n+1+6+3n+4=8n+11 2) a. (1.3n-6)+(-3n-8n)=1.3n-6-3n-8n= -10.3n-6 b.(1.3n-6)-(-3n-8n)=1.3n-6+3n+8n=12.3n-6 3) a. (-16+21)+(-3.5+n-2n)= -16+21-3.5+n-2n= -8.5-n b. (-16+21)-(-3.5+n-2n)= -16+21+3.5-n+2n=40.5+n 4) a. (-8+16.2)+(a-3a+1.5a)= -8+16.2+a-3a+1.5a=8.2-0.5a b. (-8+16.2)-(a-3a+1.5a)= -8+16.2-a+3a-1.5a=8.2+0.5a
Answers & Comments
b. (5n+1)-(-6-3n-4)=5n+1+6+3n+4=8n+11
2) a. (1.3n-6)+(-3n-8n)=1.3n-6-3n-8n= -10.3n-6
b.(1.3n-6)-(-3n-8n)=1.3n-6+3n+8n=12.3n-6
3) a. (-16+21)+(-3.5+n-2n)= -16+21-3.5+n-2n= -8.5-n
b. (-16+21)-(-3.5+n-2n)= -16+21+3.5-n+2n=40.5+n
4) a. (-8+16.2)+(a-3a+1.5a)= -8+16.2+a-3a+1.5a=8.2-0.5a
b. (-8+16.2)-(a-3a+1.5a)= -8+16.2-a+3a-1.5a=8.2+0.5a