x + 37,66 = 80,94
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x + 5,28 = 9,19 b) x - 34,87 = 58,21 c) x + 37,66 = 80,94
x = 9,19 - 5,28 x = 58,21 + 34,87 x = 80,94 - 37,66
x = 3.91 x = 89.08 x = 43,28
a, x+5,28=9,19 c, x+37,66=80,84
x=3,91 x=43,18
b, x-34,87=58,21 d, 76,22-x=38,08
x=93,08 x=38,14
![](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)
a, x +5,28 =9,19
x =9,19-5,28
x = 3,91
b,x +37,66 = 80,34
x =80,34-37,66
x =42,68
c,x - 34,87 = 58,21
x =58,21+34,87
x =122,08
d, 76,22 - x=38,08
x =76,22-38,08
x =38,14
k dùm nha mọi người
![](https://rs.olm.vn/images/avt/0.png?1311)
12,34 x 9 + 37,66 x 9
= ( 12,34 + 37,66 ) x 9
= 50 x 9
= 450
Chúc bạn học giỏi nhé Nguyễn Ngọc Anh Thư !
![](https://rs.olm.vn/images/avt/0.png?1311)
12,34+23,45+34,56+45,67+37,66+26,55+15,44+4,33
= ( 12,34 + 37,66 ) + ( 23,45 + 26,55 ) + ( 34,56 + 15,44 ) + ( 45,67 + 4,33 )
= 50 + 50 + 50 + 50
= 100 + 100
=200
= (12,34+37,66)+(23,45+26,55)+(34,56+15,44)+(45,67+4,33)
= 50 + 50 + 50 + 50
= 200
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x + 5,28 =9,19 b)tự học nhé neko bye
x=9,19-5,28
x=3,91
a) \(x+5,28=9,19\)
\(x=9,19-5,28\)
\(x=3,91\)
b) \(x+37,66=80,84\)
\(x=80,84-37,66\)
\(x=43,18\)
c) \(x-34,87=58,21\)
\(x=58,21+34,87\)
\(x=93,08\)
d) \(76,22-x=38,08\)
\(x=76,22-38,08\)
\(x=38,14\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x(1-1)=1
<=>x.0=1
<=>0=1 ( vô nghiệm)
b)x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x= 54x