a,45,75+25,5x3,5-35

=45,75+(25,5x3,5)-35

=45,75+89,25-35

=135-35

=100

b,166,32:46,2+16x0,4

=(166,32:46,2)+(16x0,4)

=3,6+6.4

=10

a)\(25,5+y-12,5=4.7\)

⇔\(13+y=28\)

⇔\(y=15\)

b)\(76,22-y-25,7=30+5,52\)

⇔\(50,52-y=35,52\)

⇔\(y=15\)

c)\(4,5-y+1,2=3,5\)

⇔\(5,7-y=3,5\)

⇔\(y=2,2\)

\(a,\Rightarrow10+y=28\\ \Rightarrow y=18\\ b,\Rightarrow50,52-y=35,52\\ \Rightarrow y=15\\ c,\Rightarrow5,7-y=3,5\\ \Rightarrow y=2,2\)

a) \(25,5+y-12,5=4\times7\)
\(\Rightarrow25,5+y-12,5=28\)
\(\Rightarrow y-12,5=28-25,5\)
\(\Rightarrow y-12,5=2,5\)
\(\Rightarrow y=2,5+12,5\)
\(\Rightarrow y=15\)
b) \(76,22-y-25,7=30+5,52\)
\(\Rightarrow76,22-y-25,7=35,52\)
\(\Rightarrow y-25,7=76,22-35,52\)
\(\Rightarrow y-25,7=40,7\)
\(\Rightarrow y=40,7+25,7\)
\(\Rightarrow y=66,4\)
c) \(4,5-y+1,2=3,5\)
\(\Rightarrow4,5-y=3,5-1,2\)
\(\Rightarrow4,5-y=2,3\)
\(\Rightarrow y=4,5-2,3\)
\(\Rightarrow y=2,2\)

bằng100; bang10

a) 100

b) 10

a) 45,75 + 25,5 x 3,5 - 35

= 45, 75 + 89,25 - 35

= 135 - 35

= 100

b) 166,32 : 46,2 + 16 x 0,4

= 3,6 + 6,4

= 10

a) 45,75 + 25,5 × 3,5 - 35 = 45,75 + 89,25 - 35 = 135 - 35 = 100

b) 166,32 : 46,2 + 16 × 0,4 = 3,6 + 6,4 = 10

 (-4).(+3).(-125).(-8)=-12000

b) (-67).(1-301)-301.67= -67

a: =22+25,5=47,5

b: \(=-9.207-1.503+3,8-28=-10,71-28+3,8\)

=-34,91

c: =-12,5-3,5+17,55+2,45

=20-16=4

d: =2,07+1,03-7,36-7,64+8,97=3,1-15+8,97=-2,93

e: =2,07+4,23+3,005-12,005

=6,3-9=-2,7

f: \(=4,35-2,67+1,65+3,54-6,33=6-9+3,54=3,54-3=0,54\)

`a)53,2:(x-3,5)+45,8=99`

`53,2:(x-3,5)=99-45,8`

`53,2:(x-3,5)=53,2`

`x-3,5=53,2:53,2=1`

`x=1+3,5=4,5`

________________________________________

\(b)4,25\times(x+41,53)-125=53,5\)

\(4,25\times(x+41,53)=53,5+125=178,5\)

`x+41,53=178,5:4,25`

`x+41,53=42`

`x=42-41,53`

`x=0,47`

53,2:(x-3,5)+45,8=99
=> 53,2 :(x-3,5) = 99-45,8
=> 53,2 :(x-3,5) = 53,2
=> x-3,5= 53,2 : 53,2
=> x-3,5 = 1
=> x= 1+3,5
=> x= 4,5

câu còn lại tương tự nhé

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