Question

CALCULATI IN DOUA MODURI :
a) 50*(27+3)
b) 14*49+71*14
c) 17*7+64*7+7*119
d) 450*21+550*21-2100
e) 736*17-236*17+200*17

Answer 1

a) 50*(27+3)=50*27+50*3=1350+150=1500

50*(27+3)=50*30=1500

b) 14*49+71*14=686+994=1680

14*49+71*14=14*(49+71)=14*120=1680

c) 17*7+64*7+7*119=7*(17+64+119)=7*200=1400


17*7+64*7+7*119=119+448+833=1400



d) 450*21+550*21-2100=21*(450+550-100)=21*900=18900

450*21+550*21-2100=9450+11550-2100=21000-2100=18900

e) 736*17-236*17+200*17 =17*(736-236+200)=17*700=11900

736*17-236*17+200*17 =12512-4012+3400=8500+3400=11900

Answer 2

I metoda:
a) 50×30=1500;
b) 686+994=1680;
c) 119+448+833=1400;
d) 9450+11550-2100=18900;
e) 12512-4012+3400=11900;

II metoda:
a) 50×30=1500;
b) (49+71)*14=1680;
c) (17+64+119)*7=1400;
d) (450+550)*21-2100=18900;
e)(736-236+200)*17=11900.