Question

Ex 1 si 2!! Va rog ! Imi trebuie urgentt!!

Answer 1

1
a) 4 x 25 = 4 x (20+5) = 4 x 20 + 5 = 4 x 20 + 4 × 5 = 80 + 20 = 100

6 x 15 = 6 x (10+5) = 6 x 10 + 5 = 6 x 10 + 6 x 5 = 60 + 30 = 90

3 x 24 = 3 x ( 20 + 4 ) = 3 x 20 + 4 = 3 x 20 + 3 x 4 = 60 + 12 = 72

b)
27 x 3 = 81
3 × 7 = 21 21+
3 × 2 = 6 6 =81
R : 81
35 x 4 = 140
4 x 5 = 20 20+ ( 0 se copie nu se adună)
4 x 3 = 12 12 = 140
R : 140
2.
17 x 6 + □□ = 174
17 x 6 = 102
174 - 102 = 72
R : 72

□□□ - 24 x 4 = 49
24 x 4 = 96
96 + 49 = 145
R : 145
□□□ + 38 x 5 =312
38 x 5 = 190
312 - 190 = 122
R : 122