( x + 1259 ) x 5 = 67845
67845 x 123 =
(1259 - y x 3) :5= 55
(1259 - 3y) : 5 = 55
=> 1259 - 3y = 275
=> 3y = 984
=> y = 328
( 1259 - y x 3 ) : 5 = 55
1259 - y x 3 = 55 x 5
1259 - y x 3 = 275
y x 3 = 1259 - 275
y x 3 = 984
y = 984 : 3
y = 328
1259 - y x 3 = 55 x 5 = 275
y x 3 = 1259 - 275 = 984
y = 984 : 3
y = 328
( 1259 - x 3 ) : 5 = 55
(1259-3x):5=55
1259-3x=275
3x=1259-275
3x=984
x=328
tìm x:
x+125+159=1259
x+125+159=1259
=> x=1259-159-125
=>x=975
X + 125 + 159 = 1259
X + 125 = 1259 - 159
X + 125 = 1100
X = 1100 - 125
X = 975
1259+x=3457
1259 + x = 3457
x = 3457 - 1259
x = 2198
Bài 2: Tính nhanh
a) (35-815)-(795-65)
b) 5-197-2015-2015
c) 1259-1409-12+1259+1409
d) -5+(-37)-45+151-37+151
e) 53-145-359-53+145-259
\(a.\left(35-815\right)-\left(795-65\right)\\ =35-815-795+65\\ =\left(35+65\right)-\left(815+795\right)\\ =100-1610=-1510\)
Bài 2:
a: Ta có: \(\left(35-815\right)-\left(795-65\right)\)
\(=35-815-795+65\)
\(=100-1600\)
=-1500
b: Ta có: \(5-197-2015-2015\)
\(=-2010-2212\)
=-4222
c: Ta có: \(1259-1409-12+1259+1409\)
\(=2518-12\)
=2506
12 + 34 + 56 + 78 + 123 + 99 + 322 + 199 = ?
12 x 45 x 67 x 89 x 0 = ?
12 : 4 : 3 x 9 : 3 x 1259 = ?
12 + 34 + 56 + 78 + 123 + 99 + 322 + 199 = 1223
12 x 45 x 67 x 89 x 0 = 0
12 : 4 : 3 x 9 : 3 x 1259 = 3777
Tk nha
bài 1:
b,67845:312
Tìm y :
a/ 67845 – y = 29361