1) 820x7=5740
2) 3800x5=19000
3) 1100x6=6600
4)4120x4=16480
( 362 + 458 )*7=362 *7 +458 *7=2 534 + 3 206 =5 740
( 2 864 +936)*5 =2 864 *5 + 936*5 =14 320 + 4 680=19 000
( 2 924 - 1 824) *6 =2 924 *6 + 1 824 *6 =17 544 - 10 944=6 600
( 5 600 - 1 480)* 4=5 600 *4 - 1 480 *4 =22 400 - 5 920 =16 480
1) 820x7=5740
2) 3800x5=19000
3) 1100x6=6600
4)4120x4=16480
( 362 + 458 )*7=362 *7 +458 *7=2 534 + 3 206 =5 740
( 2 864 +936)*5 =2 864 *5 + 936*5 =14 320 + 4 680=19 000
( 2 924 - 1 824) *6 =2 924 *6 + 1 824 *6 =17 544 - 10 944=6 600
( 5 600 - 1 480)* 4=5 600 *4 - 1 480 *4 =22 400 - 5 920 =16 480