Условие:

420 * 8;
390 * 3;
4700 * 5;
6800 * 6;
30700 * 9;
20080 * 7;
500786 * 4;
4329 + 932 * 8.

420 * 8 = 3360
× 420 8 ¯ 3360
 
390 * 3 = 1170
× 390 3 ¯ 1170
 
4700 * 5 = 23500
× 4700 5 ¯ 23500
 
6800 * 6 = 40800
× 6800 6 ¯ 40800
 
30700 * 9 = 276300
× 30700 9 ¯ 276300
 
20080 * 7 = 140560
× 20080 7 ¯ 140560
 
500786 * 4 = 50003144 = 1856
× 786 4 ¯ 3144
 
- 500 3144 1856
 
4329 + 932 * 8 = 4329 + 7456 = 11785
× 932 8 ¯ 7456
 
+ 4329 7456 11785