1) 178,6:47=3,8
2) 441:45=9,8
3) 28900:85=3,40=3,4
18-15x+17x-10=8-2x=2(4-x))))))))))
3 1/7 а - b
__________
b/14ab=1/14a
-1/14a + 1/14a =0
3a +1/7a=3 17a
7^10 - 7^9 - 7^8 = 7^8 * (7^2 - 7 - 1) = 7^8 * (49 - 8) = 7^8 * 41---кратно 41
4х^2-16х=0
х (4х-16)=0
х=0; 4х-16=0
4х=16
х=4