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a,Xx3,7+Xx6,3=12,09 X x{3,7+6,3}=12,09 X x 10=12,09 X=12,09:10 X=1,209 b,213,56-1,7x9,3+10,94 =213,56-15,81+10,94 =197,75+10,94 =208,69
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1,7 x 3,4 + 4,3 x 1,7 + 2,3 x 1,7
= 1,7 x ( 3,4 + 4,3 + 2,3 )
= 1,7 x 10
= 17
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x = 85:1,7 = 50
x = 12,32:0,22 = 56
x = 1,2168 : 0,26 = 4,68
x = 17,2032 :1,28 = 13,44
a, X x 1,7 = 85
=> x = 85:1,7
=>x=50
b, 0,22 x X = 12 , 32
=>x = 12,32:0,22
=>x= 56
c, X x 0,26 = 1,17 x 1,04
=> x = 1,2168 : 0,26
=>x= 4,68
d, X x 1,28 = 4,48 x 3,84
=>x = 17,2032 :1,28
=>x = 13,44
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x*1,7=5,95
x=5,95/1,7
x=3.5
4,32*x=10,368
x=10,368/4,32
x=2,4
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1,2 : x = 1,7 ( dư 0,01)
x = ( 1,2 - 0,01) : 1,7
x = 1,19 : 1,7
x = 0,7
Đây bạn nha!
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1.Ta có:1/2=1/1.2
1/6=1/2.3
1/12=1/3.4
........
=>1/2+1/6+1/12+1/20+1/30=1/1.2+1/2.3+1/3.4+1/4.5+1/5.6
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6
2.hinh nhu sai đe
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\(\)a} x : 3,1 = 1,47 {dư 0,013}
\(x=1,47.3,1+0,013\)
\(x=4,557+0,013\)
\(x=4,57\)
b} 1,2 : x = 1,7 {dư 0,01}
\(x=\left(1,2-0,01\right):1,7\)
\(x=1,19:1,7\)
\(x=0,7\)
học tốt
X x 1,7 + 2,2 x X + X = 6488
\(x\cdot1,7+2,2\cdot x+x\cdot1=6488\)
\(x\cdot\left(1,7+2,2+1\right)=6488\)
\(x\cdot4=6488\)
x=6488/4
x=1622