Question

va rog este urgent ajutorrrr
Calculează grupând convenabil:
2 x 43 x 5 x 10 =
6 x 19 x 5 =
2x 13 x 50 =
2x 8 x 100 x 5 =
12 x 147 x 10 =
15 x 16 x 2 =
2x 25 x 2 x 60 =
4 x 68 x 25 x 10 =​

Answer 1

86•5•10=430•10=4300
114•5=570
26•50=1300
16•100=1600•5=8000
1764•10=17640
240•2=480
50•2•60=100•60=6000
272•25•10=6800•10=68000

Answer 2

Răspuns:

Explicație pas cu pas:

2 × 43 × 5 × 10 = 43 × (2×5×10) = 43 × 100 = 4 300

  → folosesc asociativitatea

6 × 19 × 5 = 19 × (6×5) = 19×30 = 570

2 × 13 × 50 = 13 × (2×50) = 13×100 = 1 300

2 × 8 × 100 × 5 = (8×100) × (2×5) = 800 ×10 = 8 000

12 × 147 × 10 = 147 × (12×10) = 147 ×120 = 17 640

15 × 16 × 2 = 16 × (15×2) = 16×30 = 480

2×25×2×60 = 60 × (2×2×25) = 60 × 100 = 6 000

4 × 68 × 25 × 10 = (68×10) × (4×25) = 680 × 100 = 68 000