Question

Scoate factorul comun, apoi calculeaza:
a) 5×13-5×3
b) 19+19×9
c) 23×11-23
d) 7×8+2×7+10×7
e) 41×132-41×32
f) 37×28+42×37-37×15
g) 27×8+2×27+27×10
h) 8×49+8×31-8×50
i) 15×99+15×13-15×112
j) 25×13+25×8-25×11

Answer 1

Răspuns:

Explicație pas cu pas:

a) 5 × 13 - 5 × 3 = 5 × (13 - 3) = 5 × 10 = 50

b) 19 + 19 × 9 = 19 × (1 + 9) = 19 × 10 = 190

c) 23 × 11 - 23 = 23 × (11 - 1) = 23 × 10 = 230

d) 7 × 8 + 2 × 7 + 10 × 7 = 7 × (8 + 2 + 10) = 7 × 20 = 140

e) 41 × 132 - 41 × 32 = 41 × (132 - 32) = 41 × 100 = 4100

f) 37 × 28 + 42 × 37 - 37 × 15 = 37 × (28 + 42 - 15) = 37 × 55 = 2035

g) 27 × 8 + 2 × 27 + 27 × 10 = 27 × (8 + 2 + 10) = 27 × 20 = 540

h) 8 × 49 + 8 × 31 - 8 × 50 = 8 × (49 + 31 - 50) = 8 × 30 = 240

i) 15 × 99 + 15 × 13 - 15 × 112 = 15 × (99 + 13 - 112) = 15 × 0 = 0

j) 25 × 13 + 25 × 8 - 25 × 11 = 25 × (13 + 8 - 11) = 25 × 10 = 250