a) 720 : ( x . 2 + x . 3 ) = 3.2
720 : ( x . 2 + x.3 ) = 6
( x .2 + x.3 ) = 720 : 6
x.2+x.3 = 120
x . ( 2 + 3 ) = 120
x . 5 = 120
x = 120 : 5
x = 24
0o0 giờ mk ms bt là lp 4 đã hok cái dạng thế này jo day
[1+x]+[2+x]+[3+x]+[4+x]+[5+x]=10*5
[1+2+3+4+5]+[x*5]=50
15+x*5=50
x*5=50-15
x*5=35
x=35/5
x=7
a) 720 : ( x . 2 + x . 3 ) = 3.2
720 : ( x . 2 + x.3 ) = 6
( x .2 + x.3 ) = 720 : 6
x.2+x.3 = 120
x . ( 2 + 3 ) = 120
x . 5 = 120
x = 120 : 5
x = 24
a)Ta có :
720 : ( x . 2 + x . 3 ) = 3.2
720 : ( x . 2 + x.3 ) = 6
( x .2 + x.3 ) = 720 : 6
x.2+x.3 = 120
x . ( 2 + 3 ) = 120
x . 5 = 120
x = 120 : 5
x = 24
hok tốt
720 : ( x . 2 + x . 3 ) = 3.2
( x .2 + x.3 ) = 720 : 6
x . ( 2 + 3 ) = 120
x . 5 = 120
x = 24
P/s tham khảo nha
720 : ( x . 2 + x . 3 ) = 3.2
720 : ( x . 2 + x.3 ) = 6
( x .2 + x.3 ) = 720 : 6
x.2+x.3 = 120
x . ( 2 + 3 ) = 120
x . 5 = 120
x = 120 : 5
x = 24