2(0,5-x)^3=0,25
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a: \(24,8:0,5+24,8\cdot3+24,8:0,2\)
\(=24,8\cdot2+24,8\cdot3+24,8\cdot5\)
\(=24,8\left(2+3+5\right)\)
\(=24,8\cdot10=248\)
b: \(19,5+19,5\cdot3+19,5:0,5+19,5:0,25\)
\(=19,5+19,5\cdot3+19,5\cdot2+19,5\cdot4\)
\(=19,5\left(1+3+2+4\right)\)
\(=19,5\cdot10=195\)
c: \(121,07\cdot4+121,07:0,25+121,07:0,5\)
\(=121,07\cdot4+121,07\cdot4+121,07\cdot2\)
\(=121,07\left(4+4+2\right)\)
\(=121,07\cdot10=1210,7\)
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0,75 + 1,5 \(\times\) 97,8 \(\times\) 0,5 + 0,25 \(\times\) 3 \(\times\) 1,2
= 0,75 \(\times\) 1 + (1,5 \(\times\) 0,5)\(\times\) 97,8 + (0,25 \(\times\)3) \(\times\) 1,2
= 0,75 \(\times\) 1 + 0,75 \(\times\) 97,8 + 0,75 \(\times\) 1,2
= 0,75 \(\times\) ( 1 + 97,8 + 1,2)
= 0,75 \(\times\) [1 + ( 97,8 + 1,2)]
= 0,75 \(\times\) [1 + 99]
= 0,75 \(\times\) 100
= 75
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\cdot3:x+2\cdot6:4+x:0,5+0,25+x\cdot1=35\)
=>\(3+3+2x+0,25+x=35\)
=>3x+6,25=35
=>3x=35-6,25=28,75
=>\(x=\dfrac{28.75}{3}=\dfrac{115}{12}\)
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2(x-0,5)+3=0,25(4x-1)
\(\Leftrightarrow2x-1+3=x-\frac{1}{4}\)
\(\Leftrightarrow2x-x=-\frac{1}{4}-2\)
\(\Leftrightarrow x=-\frac{9}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 92 : 0,01 = 9200 92 x 100 = 9200 64 : 0,01= 6400
b) 25 : 0,5 = 50 25 x 2 = 50 39 : 0,5 = 78
c) 32 : 0,25 = 128 32 x 4 = 128 15 : 0,25 = 60
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Giải:
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(100.x+\left(1+2+3+...+100\right)=5750\)
Số số hạng \(\left(1+2+3+...+100\right)\) là: \(\left(100-1\right):1+1=100\)
Tổng dãy \(\left(1+2+3+...+100\right)\) là: \(\left(1+100\right).100:2=5050\)
\(\Rightarrow100.x+5050=5750\)
\(100.x=5750-5050\)
\(100.x=700\)
\(x=700:100\)
\(x=7\)
\(x+x:0,5+x:0,25+x:0,125=150\)
\(x.\left(1+2+4+8\right)=150\)
\(x.15=150\)
\(x=150:15\)
\(x=10\)
Chúc bạn học tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =472x2+472x5+472x2=472x9=4248
b: =28,8+28,8-14,4=43,2
c: =2,4(6,2+3,8)=24
2(0,5-x)3=0,25
⇔(0,5-x)3=0,125
⇔(0,5-x)3=0,53
⇔0,5-x=0,5
⇔x=0