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\(a,\\115:y\times4,8=30\\115:y=30:4,8\\115:y=6,25\\y=115:6,25\\y=18,4\\---\\b,\\1,75\times y:16,8=1,25\\1,75\times y=1,25\times16,8\\1,75\times y=21\\y=21:1,75\\y=12\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,X+X:3x4,5+X:2x7=252
X+Xx1,5+Xx7/2=252
Xx(1+1,5+7/2)=252
Xx6=252
X=42
b, (515,5x40-18)x(314:0,5xX)=17776
(20620-18)x(628xX)=17776
20602x(628xX)=17776
628 x X=17776:20602
ko bt nữa....
![](https://rs.olm.vn/images/avt/0.png?1311)
77 x 4,567 + 4,567 x 22 + 4,567 x 1
4,567 x (22+77+1) = 4,567 x 100 = 456,7
![](https://rs.olm.vn/images/avt/0.png?1311)
\(y+\frac{1}{2}y=\frac{4}{5}\\ 1y+\frac{1}{2}y=\frac{4}{5}y\\ \left(1+\frac{1}{2}\right)y=\frac{4}{5}\\ \frac{3}{2}y=\frac{4}{5}\\ y=\frac{4}{5}:\frac{3}{2}\\ y=\frac{4}{5}\times\frac{2}{3}\\ y=\frac{8}{15}\)
y + 1/2 x y =4/5
y x 2 = 4/5-1/2
y x 2 = 3/10
y= 3/10 x2
y = 6/10=3/5
![](https://rs.olm.vn/images/avt/0.png?1311)
Gấp rưỡi = 3/2
Cửa hàng đã bán được số tấn gạo tẻ là:
345 : (3+2) x 3 = 207 (tan)
k mk nha bạn
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\(2\times x\times20+15\times20-45\times20=200\)
\(40\times x+300-900=200\)
\(40\times x=200+900-300\)
\(40\times x=800\)
\(x=800:40\)
\(x=20\)
\(2.x.20+15.20-45.20=200\)
\(40.x+300-900=200\)
\(40.x=200+900-300\)
\(40.x=800\)
\(x=800:40\)
\(x=20\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x.2,9+x.0,1=1,05
x.(2,9+0,1)=1,05
x.3=1,05
x=1,05:3
x=0,35
Vậy x = 0,35
Chúc bạn học tốt
2,9 + x:10=1,05
x:10= 1,85
x = 1,85 x 10
x = 18,5
![](https://rs.olm.vn/images/avt/0.png?1311)
x . 2,9 + x : 10 = 1,05
x . 2,9 + x . 0,1 = 1,05
x . ( 2,9 + 0,1 ) = 1,05
x . 3 = 1,05
x = 1,05 : 3
x = 0,35
Vậy x = 0,35
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\times2,9+x:10=1,05\)
\(x\times2,9+x\times\frac{1}{10}=1,05\)
\(x\times\left(2,9+\frac{1}{10}\right)=1,05\)
\(x\times3=1,05\)
\(x=1,05:3\)
\(x=0,35\)
x . 2,9 + x : 10 = 1,05
x. 2,9 + x. 1/10 = 1,06
x . (2,9 + 1/10) = 1,05
x . 3 = 1,05
x = 1,05 : 3
x = 0,35