Tính chu vi hình vuông ABCD:
A B C D
AB=AC=CD=BD=9( cm)
find the natural x , know:
219 - 7(x+1)=100
(3x - 6).3=\(3^4\)
caculated:
a, \(\left[\left(-13\right)+\left(-15\right)\right]+\left(-8\right)\)
b, \(-\left(-129\right)+\left(-119\right)-301+12\)
c, \(500-\left(-200\right)-210-100\)
d,\(777-\left(-111\right)-\left(-222\right)+20\)