1) 25x(63-741:19)63-741:19 = 63 - 39 = 2425 x 24 = 600
2) (900-7218:9)x127218:9 = 802900 - 802 = 9898 x 12 = 1176
3) 3926:13x8+25843926:13 = 302302 x 8 = 24162416 + 2584 = 5000
4) 690-2944:64x152944:64 = 46690 - (46 x 15) = 690 - 690 = 0
1) 25x(63-741:19)
63-741:19 = 63 - 39 = 24
25 x 24 = 600
2) (900-7218:9)x12
7218:9 = 802
900 - 802 = 98
98 x 12 = 1176
3) 3926:13x8+2584
3926:13 = 302
302 x 8 = 2416
2416 + 2584 = 5000
4) 690-2944:64x15
2944:64 = 46
690 - (46 x 15) = 690 - 690 = 0