\(300-5\times Y+50=250\)
\(5\times Y+50=50\)
\(5\times Y=0\)
\(Y=0\)
Ta có : 300 - 5y + 50 = 250
\(\Leftrightarrow\)350 - 5y = 250
\(\Leftrightarrow\)5y = 350 - 250
\(\Leftrightarrow\)5y = 100
\(\Rightarrow\)y = 20
Vậy : y = 20
300-5y+50=250
lay 250-50=200 roi lay 300-200=100
lay 100chia cho5 thi se tim ra y
vay y =20
x + 50 = 250 + 360
x + 90 = 250 - 50
x + 300 = 300 + 50
Viết (theo mẫu):
a) 9875 = 9000 + 800 + 70 + 5 b) 2000 + 300 + 40 + 7 = 2347.
4302 = ...... 6000 + 300 + 20 + 5 = .....
5086 = ...... 8000 + 900 + 60 + 6 = .....
6730 = ...... 4000 + 300 + 50 + 8 = .....
Điền >; <; = ?
404 ..... 440 200 + 5 ..... 250
765 ..... 756 440 - 40..... 399
899 ..... 900 500 + 50 + 5 ..... 555
Đúng ghi Đ, sai ghi S:
a) 86 – 16 = 70 
b) 23 x 2 – 1 = 23 
c) 250 : 5 + 5 = 25 
d) 40 + 80 : 4 = 30 
e) 80 + 4 : 2 = 42 
f) 70 + 30 : 2 = 50 
g) 90 + 30 x 3 = 180 
h) 70 + 30 : 2 = 85 
Tìm x :
x + 50 = 300
500 - x = 300 + 50
x + 50 = 200 + 300
