Resolver esse sistema
a + 2c = 5
b + 2d = 7
2a − 2c = −2
2b − 2d = −2
7(2)-3{2^2-[6(8)/(2^2)]}
5*10⁵*22/7*0.1*0.1*√3/2
5x + 3 = -273
if 80 is the 100 percentage who much is the 70 percentage
(5x-9)^2
10^-5 x 10^2
3525=60
9110=101
1091=101
5050=?
(19-4)*(10/5)-11
(28-3*6)-63/7+5