tolong mematika 2 dan 4 dan 5 tolong

2. 5/8 x 2/4
= 10/32
= 5/16

3. 4^5 x 4^7 x 4^4
= 1.024 x 1.638 x 256
= 4.294.967.296

4. 57 - 9 + (-2) - (-11)
= 48 -2 + 11
= 46 + 11
= 57

5. -18 x 6 - 3
= -108 - 3
= -111