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10x11+10x12+10x13+10x20
=10x(11+12+13+20)
=10x56
=560
20-10+10-10+2-3=9
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20 x 10 + 20 x 10 + 20 x 80
= 20 ( 10 + 10 + 80 )
= 20 x 100
= 2000
tk mk nha !
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50 x 10 + 50 x 10
= (50 + 50) x 10
= 100 x 10
= 1000
10 x 20 + 80 x 10
= (20 + 80) x 10
= 100 x 10
= 1000
\(50.10+50.10\)
\(=500+500\)
\(=1000\)
\(10.20+80.10\)
\(=10.\left(20+80\right)\)
\(=10.100\)
\(=1000\)
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20 x 10 + 70 x 10 + 10
= (20 + 70) x 10 + 10
= 90 x 10 + 10
= 900 + 10
= 910
20 x 10 + 70 x 10 + 10
= 20 x 10 + 70 x 10 + 10 x 1
= 10 x ( 20 + 70 + 1 )
= 10 x 91
= 910
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a. x + 2,5 - 1,5 = 20 x+2,5 = 20 + 1,5 x+ 2,5=21,5 x= 21,5 - 2,5 x= 19 b. x - 10 + 5 = 10 x - 10 = 10 - 5 x - 10 = 5 x = 5 + 10 x = 15
a) x+2,5-1,5=10x2
x+(2,5-1,5)=20
x+1=20
x = 20-1
x = 19
b) x-(10+5)=(20-10)
x -15=10
x = 15+10
x = 25
nhớ k minh minh k lại
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(\(x\) + 5) + (\(x\) + 10) + (\(x\) + 15) + (\(x\) + 20) = 74
\(x\) + 5 + \(x\) + 10 + \(x\) + 15 + \(x\) + 20 = 74
(\(x\) + \(x\) + \(x\) + \(x\)) + (5 + 10 + 15 + 20) = 74
4\(x\) + 50 = 74
4\(x\) = 74 - 50
4\(x\) = 24
\(x\) = 24: 4
\(x\) = 6
x + 10 = 20
x = 20 - 10
x = 10
mik k bạn rồi,k lại nha
x + 10 = 20
x = 20 - 10
x = 10
ai tk mk mk tk lại