y.8+y.2=420
=>y.(8+2)=420
=>y.10=420
=>y=420:10
=>y=42
Dấu "." là dấu nhân
y * (8+2) = 420
y * 10= 420
y = 420:10
y = 42
dễ mà
tìm y
y x 8 +y x2 = 420
109 x y -9 x y = 2300
Tính giá trị của Y
a) 216 x Y + Y + 784 = 8000
c) Y x 46 – 36 x Y = 1230
b) Y x 62 – Y x 52 = 420
Y x \(\dfrac{1}{2}\) + Y x \(\dfrac{1}{6}\) + Y x \(\dfrac{1}{12}\) + Y x \(\dfrac{1}{20}\) = \(\dfrac{8}{5}\)
tính nhanh a/ (2+4+6+8+...+98)x(210x12+420-420x7) b/29+299+2999+29999+2999999 c/1999x1867+2000x133
X*2 +x*3+x*4+x=420
/ x × 2 + x × 3 + x × 4 + x = 420
. Tìm y:
a. 162 : y + 216 : y = 6
b. 602 : y + 123 x 2 = 253
c. 8 x (15720 – y) = 51784
y x 7/16 y x 5/8 = 2 { mk cần gấp}
Y x 8/9 + Y x 4/7 = 2/3
( Đáp án thôi )
y - 7/10 = 4/5 : 2 y x 4/9 = 3/8 x 4
