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a x x4,5=7,2
x=7,2:4,5
1,6
b 15:x+0,85+0,35
15:x=1,2
x=15:1,2
x=12,5
c x x1,4=2,8x1,5
x x1,4=4,2
x=4,2:1,4
x=3
d 1,02 x x =35,7x3,06
102 x x= 10,9242
x=10,9242:102
x=0,1071
k minh nha ^^!
a ) X x 4,5 = 7,2
X = 7,2 : 4,5
X = 1,6
b ) 15 : x = 0, 85 + 0,35
15 : x = 1,2
x = 15 : 1,2
x = 12,5
c ) X x 1,4 = 2,8 x 1,5
X x 1,4 = 4,2
X = 4,2 : 1,4
X = 3
d ) 1,02 x X = 3,57 x 3,06
1,02 x X = 10,9242
X = 10,9242 : 1,02
X = 10,71
k mình nha !
Mik gọi tạm làm 2 câu nhé a và b
a ) X x 1,4 = 2,8 x 1,5
X x 1,4 = 4,2
X = 4,2 : 1,4
X = 3
b ) 1,02 x X = 3,57 x 3,06
1,02 x X = 10,9242
X = 10,9242 : 1,02
X = 10,71
Nhớ tick mik thật nhìu nha !!!
Ta có
\(x\times1,4=2,8\times1,5\)
X x 1,4=4,2
x=3
câu b)
1,02 x X=3,57 x 3,06
1,02 x X=10,9242
X=10,71
a)9,5 x y = 47,4 + 24,8 b)15 : y = 0,85
9,5 x y = 72,2
y = 72,2 : 9,5
y = 7,6
Bai 1 :
a/ \(x:1,4+2,8=8,4\)
\(x:1,4=8,4-2,8\)
\(x:1,4=5,6\)
\(x=5,6\times1,4\)
\(x=7,84\)
b/ \(2,8:x-1,5=2,3:5,75\)
\(2,8:x-1,5=\frac{2}{5}\)
\(2,8:x=\frac{2}{5}+1,5\)
\(2,8:x=\frac{19}{10}=1,9\)
\(\Rightarrow x=2,8:1,9=\frac{28}{19}\)
Bai 2 :
a/ \(575-\left(6\times x+70\right)=445\)
\(6\times x+70=575-445\)
\(6\times x+70=130\)
\(6\times x=130-70\)
\(\Rightarrow6\times x=60\Rightarrow x=10\)
b/ \(315+\left(125-x\right)=435\)
\(125-x=435-315\)
\(125-x=120\)
\(\Rightarrow x=5\)
c/ \(\left(x-105\right):21=15\)
\(x-105=15\times21\)
\(x-105=315\)
\(\Rightarrow x=420\)
d/ \(3636:\left(12\times x-91\right)=36\)
\(12\times x-91=3636:36\)
\(12\times x-91=101\)
\(12\times x=101+91\)
\(12\times x=192\)
\(\Rightarrow x=16\)
e/ \(12\times\left(x-5\right)+73=20\)
\(12\times\left(x-5\right)=20-73\)
\(12\times\left(x-5\right)=-53\)
\(x-5=-53:12\)
\(x-5=\frac{-53}{12}\)
\(\Rightarrow x=\frac{-53}{12}+5\)
\(\Rightarrow x=\frac{7}{12}\)
f/ \(\left[\left(10-x\right)\times2+5\right]:3-2=3\)
\(\left[\left(10-x\right)\times2+5\right]:3=3+2\)
\(\left[\left(10-x\right)\times2+5\right]:3=5\)
\(\left[\left(10-x\right)\times2+5\right]=5\times3\)
\(\left(10-x\right)\times2+5=15\)
\(\left(10-x\right)\times2=15-5\)
\(\left(10-x\right)\times2=10\)
\(10-x=10:2\)
\(10-x=5\)
\(\Rightarrow x=5\)
b, 3,8 x 4,54 + 3,6 : 1,5 + 5,46 x 3,8 - 2,1 : 1,5
= 3,8 x (4,54 + 5,46) + 1,5 : (3,6 - 2,1)
= 3,8 x 10 + 1,5 : 1,5
= 38 + 1 = 39
a.30,5:(y-12,5)=12,2
y-12,5=30,5:12,2
y-12,5=2,5
y=2,5+12,5
y= 15
b.(15,5+y)x4=140,56
15,5+y=140,56:4
15,5+y=35,14
y=35,14-15,5
y=19,64
c.0,5xy=10x0,2
0,5xy=2
y=2:0,5
y=4
d.4,5:y=0,85+0,35
4,5:y=1,2
y=4,5:1,2
y=3,75
học tốt
y : 15 - 34,87 = 52,21 + 6 76,22 - y x 3 = 30,61 x 2
y : 15 - 34,87 = 58,21 76,22 - y x 3 = 61,22
y : 15 = 58,21 + 34,87 y x 3 = 76,22 - 61,22
y : 15 = 93,08 y x 3 = 15
y = 93,08 x 15 y = 15 : 3
y = 1396,2 y = 5
a/ = 3
b/ 10, 74
c/ 12,5
d/ 35, 92
Chúc bạn hok tốt
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
\(\left(b\right)y\times1,02=3,57\times3,06\)
\(\Leftrightarrow y\times1,02=10,9242\)
\(\Leftrightarrow y=10,9242\div1,02\)
\(\Leftrightarrow y=10,71\)
\(\left(c\right)15\div y-0,85=0,35\)
\(\Leftrightarrow15\div y=0,35+0,85\)
\(\Leftrightarrow15\div y=1,2\)
\(\Leftrightarrow y=15\div1,2\)
\(\Leftrightarrow y=12,5\)
\(\left(d\right)471,5-22,5\times y=12,5\)
\(\Leftrightarrow22,5\times y=471,5-12,5\)
\(\Leftrightarrow22,5\times y=459\)
\(\Leftrightarrow y=459\div22,5\)
\(\Leftrightarrow y=20,4\)
Kukad'z Lee'z
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)
\(\left(a\right)y\times1,4\div1,5=2,8\)
\(\Leftrightarrow y\times1,4=2,8\times1,5\)
\(\Leftrightarrow y\times1,4=4,2\)
\(\Leftrightarrow y=4,2\div1,4\)
\(\Leftrightarrow y=3\)