Question

A) A+(127×4-924÷3)÷4+(248×3+244÷4)÷5-234÷3=8×25

B) (3×239-48×6+831÷3-724÷7)÷3÷a=4

C) [(2960÷a-11)÷7+990]÷333=3

D) 834-[(6×4+6×6)÷a]+322=1146

Dau coroana

Answer 1

a)
a+(127×4-924÷3)÷4+(248×3+244÷4)÷5-234÷3=8×25
a+(508-308):4+(744+61):5-78=200
a+200:4+805:5-78=200
a+50+161-78=200
a=200+78-161-50  (am folosit metoda mersului invers)
a=117-50
a=67

b)
(3×239-48×6+831÷3-742÷7)÷3÷a=4
(717-288+277-106):3:a=4
(429+277-106):3:a=4
(706-106):3:a=4
600:3:a=4
200:a=4
a=200:4
a=50

c)
[(2960÷a-11)÷7+990]÷333=3
(2 960:a-11):7+990=3x333
(2960:a-11):7+990=999
(2960:a-11):7=999-990
(2960:a-11):7=9
2960:a-11=9x7
2960:a=63+11
2960:a=74
a=2960:74
a=40

d)
834-[(6×4+6×6)÷a]+322=1146
834-[(24+36):a]=1146-322
834-(60:a)=822
60:a=834-822
60:a=12
a=60:12
a=5