Question

calculati in doua moduri . 21×(36+79);
15×(55+75-10);
27×(567-456);
135×(13+11+1-20);
20×(139378-138288);
(68+42)×96 .
VA ROGGGG Urgentttttt

Answer 1

1)21×36+21×79=756+1659=2415
   21×115=2415
2)15×55+15×75-15×10=825+1125-150=1800
    15×120=1800
3)27×567-27×456=15309-12312=2997
   27×111=2997
4)20×139378-20×138288=2787560-2765760=21800
   20×1090=21800
5)68×96+42×96=6528+4032=10560
   110×96=10560

Answer 2

21×(36+79)=21*36+21*79= 756+1659=2415
21×(36+79)=21*115=2415

15×(55+75-10)=15*55+15*75-15*10=825+1125-150=1800
15×(55+75-10)=15*120=1800

27×(567-456)=27*567-27*456=15309-12312= 2997
27×(567-456)= 27*111= 2997

135×(13+11+1-20)=135*13+135*11+135-135*20=1755+1485+135-2700=
= 675
135×(13+11+1-20)=135* 5=675

20×(139378-138288)=20×139378 -20×138288= 2787560 - 2765760=
= 21800
20×(139378-138288)=20*1090= 21800

(68+42)×96 = 68*96 +42*96=6528 + 4032=10560
 (68+42)×96 = 110*96=10560