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\(17,5\text{×}x-7,5\text{×}x=34,8\\ \left(17,5-7,5\right)\text{×}x=34,8\\ 10\text{×}x=34,8\\ x=34,8:10\\ x=3,48\)
a) x : 1,25 + 17,5 : 1,25 = 19,8
( x + 17,5 ) : 1,25 = 19,8
x + 17,5 = 19,8 x 1,25
x + 17,5 = 24,75
x = 24,75 - 17,5
x = 7,25
Vậy x = 7,25
b) x : 0,7 - 1,6 = 3,8
x : 0,7 = 3,8 + 1,6
x : 0,7 = 5,4
x = 5,4 x 0,7
x = 3,78
Vậy x = 3,78
17,5 x 63 + 17,5 x 36 + 10 + 7,5
= 17,5 x 63 + 17,5 x 36 + 17,5 x 1
= 17,5 x (63 + 36 + 1)
= 17,5 x 100
= 1750
= 17,5 x 63 + 17,5 x 36 + 17,5 x 1
= 17,5 x (63 + 36 + 1)
= 17,5 x 100
= 1750
a) \(2\dfrac{4}{9}+6\dfrac{7}{11}+7\dfrac{5}{9}+13\dfrac{4}{11}\)
\(=2+\dfrac{4}{9}+6+\dfrac{7}{11}+7+\dfrac{5}{9}+13+\dfrac{4}{11}\)
\(=\left(2+6+7+13\right)+\left(\dfrac{4}{9}+\dfrac{5}{9}\right)+\left(\dfrac{7}{11}+\dfrac{4}{11}\right)\)
\(=28+1+1\)
\(=30\)
b) \(\dfrac{3}{4}+\dfrac{1}{2}\times\dfrac{12}{5}-1\dfrac{1}{2}\)
\(=\dfrac{3}{4}+\dfrac{1}{2}-1-\dfrac{1}{2}\)
\(=\dfrac{3}{4}-1\)
\(=\dfrac{3}{4}-\dfrac{4}{4}\)
\(=-\dfrac{1}{4}\)
a: \(17,5\cdot4\cdot3\cdot25\)
\(=17,5\cdot3\cdot\left(4\cdot25\right)\)
\(=52,5\cdot100=5250\)
b: \(25,6\cdot7,5+25,6\cdot2,5\)
\(=25,6\left(7,5+2,5\right)\)
\(=25,6\cdot10=256\)
c: \(4,52\cdot12,5-2,5\cdot4,25\)
\(=2,5\left(4,52\cdot5-4,25\right)\)
\(=2,5\cdot18,35=45,875\)
d: \(7,7\cdot9+7,7\)
\(=7,7\left(9+1\right)\)
\(=7,7\cdot10=77\)
\(a.4,75+x=2,4\times5,6\)
\(4,75+x=13,44\)
\(x=13,44-4,75\)
\(x=8,69\)
\(c.x\times7,5=44,625:1,7\)
\(x\times7,5=26,25\)
\(x=26,25:7,5\)
\(x=3,5\)
\(b.x-7,3=13,8+9,37\)
\(x-7,3=23,17\)
\(x=23,17+7,3\)
\(x=30,47\)
\(d.x:6,4=34,7-23,85\)
\(x:6,4=10,85\)
\(x=10,85\times6,4\)
\(x=69,44\)
Bài 6.Tìm x:
a) 4,75 + x = 2,4 x 5,6;
4,75 + x = 13,44
x = 13,44 - 4,75
x = 8,69
b) x – 7,3 = 13,8 + 9,37;
x – 7,3 = 23,17
x = 23,17 + 7,3
x = 30,47
c) x x 7,5 = 44,625 : 1,7;
x x 7,5 = 26,25
x = 26,25 : 7,5
x = 3,5
d) x : 6,4 = 34,7 – 23,85
x : 6,4 = 10,85
x = 10,85 x 6,4
x = 69,44