Scoate factorul comun, apoi calculeaza :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+15×13-15×122;j)25×14+25×8-25×11.

c) 23x11-23 = 23x(11-1) = 23x10=230

d) 7x8+2x7+10x7 = 7x(8+2+10) = 7x20 = 140

e) 41x132-41x32 = 41x(132-32) = 41x100 = 4100

f) 37x28+42x37-37-15 = 37x(28+42-15) = 37 x 55 = 2035

g) 27x8+2x27+27x10 = 27x(8+2+10) = 27 x 20 = 540

h) 8x49+8x31-8x50 = 8x(49+8-50) = 8x7 = 56

i) 15x99 +15x13-15x122 = 15 x (99+15-122) = 15 x (-8) = -120 nu este numar natural (posibil exercitiu gresit)

j) 25x14+25x8-25x11 = 25 x (14+8-11) = 25 x 11 = 275