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![](https://rs.olm.vn/images/avt/0.png?1311)
Tìm x
X+17,67=100-63,2
\(x+17,67=36,8\)
\(x=36,8-17,67\)
\(x=19,13\)
Tính bằng cách thuận tiện nhất
2,75×6,93-2,75÷1,93
mk nghĩ là bn viết sai đề
1. 2,75×6,93-2,75x1,93
=\(2,75.\left(6,93-1,93\right)\)
\(=2,75.5\)
\(=13,75\)
2.2,75:6,93-2,75÷1,93
=\(2,75:\left(6,93-1,93\right)\)
\(=2,75:5\)
\(=0,55\)
\(Học\)\(tốt\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1.a.4,47x6,1+2,53x6,1=\left(4,47+2,53\right)x6,1\)
\(=7x6,1\)
\(=42,7\)
\(b.4,56:0,57x6,3-4,8=8x6,3-4,8\)
\(=50,4-4,8\)
\(=45,6\)
\(c.\frac{13}{4}x\frac{5}{7}=\frac{65}{28}\)
\(d.\frac{7}{2}:\frac{21}{4}=\frac{28}{42}\)
\(2.a.15\%\)của\(450kg=67,5kg\)
\(b.25\%\)của\(800m=200m\)
\(c.75\%\)của\(90\)tấn\(67,5\)tấn
\(d.16\%\)của\(320m=51,2m\)
a) 4,47 x 6,1 + 2,53 x 6,1
= 6,1 x (4,47+2,53)
= 6,1 x 7
= 42,7
b) 4,56 : 0,57 x 6,3 - 4,8
= 8 x 6,3 - 4,8
= 50,4 - 4,8
= 45,6
c)\(1\frac{3}{4}\times\frac{5}{7}=\frac{7}{4}\times\frac{5}{7}=\frac{5}{4}\)
d) \(\frac{7}{2}:2\frac{1}{4}=\frac{7}{2}:\frac{9}{4}=\frac{7}{2}\times\frac{4}{9}=\frac{28}{18}=\frac{14}{9}\)
mỏi quá r bn làm tiếp nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
A.x+17,67=100-63,2
x+17,67= 36.8
x = 36,8 - 17,67
x = 19.13
B.468:x=24,8+35,2
468:x= 60
x= 468:60
x=7.8
C.Xx4,5=352,1-191,9
Xx4,5= 160.2
X = 160,2 :4,5
X = 35.6
D.Xx96+x:0,25=7856
Xx96+ Xx4 =7856
X x( 96 + 4 ) =7856
X x 100 = 7856
X = 7856 : 100
X = 78.56
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =>x+17,67=36,8
=>x=19,13
b: =>468:x=60
=>x=7,8
c: =>x*4,5=160,4
=>x=1604/45
d: =>100x=7856
=>x=78,56
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:a)\(\left(99,5-x\right)+3,82=30\)
\(99,5-x=30+3,82=33,82\)
\(x=99,5-33,82=65,68\)
b)\(x+37,66=80,94\)
\(x=80,94-37,66=43,28\)
c)\(76,22-x=38,08\)
\(x=76,22-38,08=38,14\)
d)\(36,7-x=21,205\)
\(x=36,7-21,205=15,495\)
e)\(x+17,67=100-63,2\)
\(x+17,67=36,8\)
\(x=36,8-17,67=19,13\)
Bài 3:
a)\(15,27-4,13-1,14\)
\(=\)\(15,27-1,14-4,13\)
\(=14,13-4,13=10\)
b)\(60-26,75-13,25\)
\(=\)\(60-\left(26,75+13,25\right)\)
\(=60-40=20\)
c)\(38,25-18,75+21,64-11,64+9,23\)
\(=\left(38,25-18,75\right)+\left(21,64-11,64\right)+9,23\)
\(=9,5+10+9,3\)
\(=19,5+9,3=28,8\)
Phần này mk ko chắc đâu nhé.
d)\(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)
\(=72,69+18,47-8,47-22,69\)
\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)
\(=50+10=60\)
e)\(60-13,75-26,25\)
\(=60-26,25-13,75\)
\(=33,75-13,75=20\)
g)\(15,27-4,18-2,09\)
\(=15,27-2,09-4,18\)
\(=13,18-4,18=9\)
h)\(45,28+52,17-15,28-12,17\)
\(=\left(45,28-15,28\right)+\left(52,17-12,17\right)\)
\(=30+40=70\)
i)\(\left(8,27+7,16+9,33\right)-\left(7,27+6,16+8,33\right)\)
\(=8,27+7,16+9,33-7,27-6,16-8,33\)
\(=\left(8,27-7,27\right)+\left(7,16-6,16\right)+\left(9,33-8,33\right)\)
\(=1+1+1=3\)
Viết cái đống này mak hoa cả mắt. Mk đã tốn công vậy rùi nên bn nhất định phải k cho mk đó nha.(ko mk giận đó)
![](https://rs.olm.vn/images/avt/0.png?1311)
3 1/2 = 7/2...
5 3/4 = ...23/4
2 1/5 = ...11/5
2. TÌm x
x + 17,67 = 100 - 63,2
x + 17,67 = 36,8
x = 36,8 - 17,67
x = 11,13
\(A=2,53\times17+17,67\times15+2,53\times83+17,67\times85\)
\(A=2,53\times17+2,53\times83+17,67\times15+17,67\times85\)
\(A=2,53\times\left(17+83\right)+17,67\times\left(15+85\right)\)
\(A=2,53\times100+17,67\times100\)
\(A=253+1767\)
\(A=2020\)
Tìm y biết y : 10 + y × 3,9 =4,8