(40 179 – 15 395 : 5) · 4 = 148 400.
1) 15 395 : 5 = 3079;
2) 40 179 – 3079 = 37 100;
3) 37 100 · 4 = 148 400.
15 · (54 : 3 – 84 : 7) = 90.
1) 54 : 3 = 18;
2) 84 : 7 = 12;
3) 18 – 12 = 6;
4) 15 · 6 = 90.