Question

Calculeaza pe caiet, respectand regurile invatate: 300-(27×4+46×2):10+10-10 ; 5×(395+638+437):6+9-(12+3) ;[(4×81-32)×2-(200-86)]:10 ;[(99:9)-1]×[69-(23×15:5)]+5 ;[(105×3+138):3]+45+104.

Answer 1

300-(27X4+46X2):10+10-10=
300-(108+92):10+10-10=
300-200:10+10-10=
300-20+10-10=
280+10-10=
290-10=280

5×(395+638+437):6+9-(12+3)
5X(1033+437):6+9-(12+3)=
5X1470:6+9-(12+3)=
7350:6+9-(12+3)=
1225+9-(12+3)=
1234-(12+3)=
1234-15=1219

[(4×81-32)×2-(200-86)]:10
[(324-32)X2-(200-86)]:10=
[292X2-(200-86)]:10=
[584-(200-86)]:10=
(584-114):10=
470:10=47

[(99:9)-1]×[69-(23×15:5)]+5
[(99:9)-1]x[69-(23x15:5)]+5=
[11-1]x[69-(23x15:5)]+5=
10-[69-(23x15:5)]+5=
10-[69-(345:5)]+5=
10-(69-69)+5=
10-0+5=
10+5=15

[(105×3+138):3]+45+104.
[(315+138):3]+45+104=
[453:3]+45+104=
151+45+104=
196+104=300
 le-am facut pe toate