Question

ajutor! va rog!dau 40 de puncte,doar rezolvati cateva din aceste exercitii:

scoate factorul comun,apoi calculeaza: 5x13-5x3;

19+19x9; 23x11-23; 7x8+2x7+10x7 41x132-41x32; 37x28+42x37-37x15;

27x+2x27+27x10; 8x49+8x31-8x50; 15x99+15x13-15x112; 25x13+25x8-25x11;

Answer 1

5x13-5x3 = 5x(13-3)=5x10=50

19+19x9 = 19x (1+9) = 19x10=190

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

7x8+2x7+10x7 = 7x(8+2+7)=7x17=119

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

37x28+42x37-37x15 = 37x(28+42-15)=37x55=2035

27x8+2x27+27x10 = 27x(8+2+10)=27x20=540

8x49+8x31-8x50 = 8x(49+31-50)=8x30=240

15x99+15x13-15x112 = 15x(99+13-112)=15x0=0

25x13+25x8-25x11=25x(13+8-11)=25x10=250

Answer 2

19+19×9=19(1+9)=19×10=190

23×11-23=23(11-1)=23×10=230

7×8+2×7+10×7=7(8+2+10)=7×20=140

41×132-41×32=41(132-32)=41×100=4100

37×28+42×37-37×15=37(28+42-15)=37×(70-15)=37×55=2035

27+2×27+27×10=27(1+2+10)=27×13=351

8×49+8×31-8×50=8(49+31-50)=8×(80-50)=8×30=240

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

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