19,6 giờ : 5
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
19,6 x 72 + 27 x 19,6 + 19,6
= 19,6 x ( 72 + 27 + 1)
= 19,6 x 100
= 1960
\(19,6\cdot72+27\cdot19,6+19,6\)
\(=19,6\left(72+27+1\right)\)
\(=19,6\cdot100\)
\(=1960\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Xx\(\frac{1}{4}\)+Xx\(\frac{1}{5}\)+Xx2=19,6
XxXxX=19,6:2:\(\frac{1}{5}\):\(\frac{1}{4}\)
Xx3=196
X=196:3
X=\(\frac{196}{3}\)
nhé bạn
\(x.\frac{1}{4}+x.\frac{1}{5}+x.2=19.6\)
\(x.\left(\frac{1}{4}+\frac{1}{5}+2\right)=19,6\)
\(x.2,45=19,6\)
\(x=19,6:2,45\)
\(x=8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x * 1/4 + x *1/5 + x * 2 = 19,6
x * ( 1/4 + 1/5 + 2 ) = 19,6
x * 49/20 = 19,6
x = 19,6 : 49/20
x = 196/10 : 49/20
x = 98/5 *20/49
x = 8
tk và kb ủng hộ mk nha!!!!!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
-(23,5 . 5 + 19,6) + 5 . 23,5 - (6 - 19,6)
= -23,5 . 5 - 19,6 + 5 . 23,5 - (-13,6)
= 23,5 (-5 + 5) - (19,6 - 13,6)
= 0 - 6 = -6
![](https://rs.olm.vn/images/avt/0.png?1311)
b, \(x\)x \(\frac{1}{4}\)+ \(x\)x \(\frac{1}{5}\)+ \(x\)x 2 = 19,6
\(x\)x (\(\frac{1}{4}+\frac{1}{5}+2\)) = 19,6
\(x\)x\(\frac{49}{20}\)= 19,6
\(x\) = \(19,6:\frac{49}{20}\)
\(x=8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 1/4+X x 1/5+X x 2=19,6
X x (1/4+1/5+2)=19,6
X x 2,45=19,6
X=19,6:2,45
X=8
![](https://rs.olm.vn/images/avt/0.png?1311)
x . 1/4 + x . 1/5 + x . 2 = 19,6
x . ( 1/4 + 1/5 + 2 ) = 19,6
x . 49/20 = 19,6
x = 19,6 : 49/20
x = 8
![](https://rs.olm.vn/images/avt/0.png?1311)
19,6 : 5 = 3,95
3,92 giờ