Bai 1Tim x
a)(x+1)+(x+2)+(x+3)+...+(x+28)=462
b)890:x=35 dư 15
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\(a,x:\left(111-99\right)=17\cdot5\\ \Leftrightarrow x:12=85\\ \Leftrightarrow x=1020\\ b,\left(509+335\right):x=840:35\\ \Leftrightarrow844:x=24\\ \Leftrightarrow x=\dfrac{211}{6}\\ c,\left(x+1\right)+\left(x+2\right)+...+\left(x+28\right)=462\\ \Leftrightarrow28x+406=462\\ \Leftrightarrow28x=56\\ \Leftrightarrow x=2\)
d, 890 : x = 35 dư 15
\(\Rightarrow35x+15=890\\ \Leftrightarrow35x=875\\ \Leftrightarrow x=25\)
Lời giải:
$890=x\times 35+15$
$890-15=x\times 35$
$875=x\times 35$
$x=875:35=25$
\(\frac{12}{36}=\frac{1}{3}\) ; \(\frac{75}{300}=\frac{1}{4}\) ; \(\frac{1313}{1717}=\frac{13}{17}\) ; \(\frac{1515}{2424}=\frac{15}{24}\); \(\frac{121}{1111}=\frac{11}{101}\) \(\frac{303}{3003}=\frac{101}{1001}\)
a,X=1020
b,X=20736
c,d, tự làm
\(\frac{1}{3};\frac{1}{4};\frac{11}{101};\frac{13}{17};\frac{101}{1001};\frac{5}{8}\)
Ta có: \(890:x=35\) (dư 15)
\(\Rightarrow\left(890-15\right):35=x\)
\(\Rightarrow875:35=x\)
\(\Rightarrow x=25\)
Vậy x = 25
890 : x = 35 dư 15
890 = 35x + 15
890 - 15 = 35x
875 = 35x
875 : 35 = x
=> x = 25
Tham Khảo:
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a,\(x+3=15\)
\(=>x=15-3=12\)
b,\(x-7+3=25\)
\(=>x=25+7-3=29\)
c,\(x-3-6=-4\)
\(=>x=-4+6+3=5\)
d,\(26-x+9=-13\)
\(=>26-x=-13-9=-22\)
\(=>26+22=x\)
\(=>x=48\)
x+3=15
x=15-3
x=12
Vậy x=12
x-7+3=25
x-7=25-3
x-7=22
x=22+7
x=29
Vậy x=29
x-3-6=-4
x-3=-4+6
x-3=2
x=2+3
x=5
Vậy x=5
26-x+9=-13
26-x=-13-9
26-x=22
x=26-22
x=4
Vậy x=4
890 : x = 35 dư 15
x = (890 - 15) : 35
x = 25
1482 : x + 23 = 80
1482 : x = 80 - 23
1482 : x = 57
x = 1482 : 57
x = 26
15 - 5 x (x - 1 ) = 10
5 x ( x - 1 ) = 15 - 10
5 x (x - 1) = 5
x - 1 = 5 : 5
x - 1 = 1
x = 1 + 1
x = 2
6x - 5 = 613
6x = 613 + 5
6x = 618
x = 103
890 : x = 35 ( dư 15 )
x = ( 890 - 15 ) : 35
x = 25
1482 : x + 23 = 80
1483 : x = 80 - 23
1483 : x = 57
x = 1483 : 57
x = 26
15 - 5 x ( x - 1 ) = 10
5 x ( x - 1 ) = 15 - 10
5 x ( x - 1 ) = 5
x - 1 = 5 : 5
x - 1 = 1
x = 1 + 1
x = 2
6x - 5 = 613
6x = 613 + 5
6x = 118
x = 118
\(890:x=35\left(dư15\right)\)
\(\Rightarrow x=\frac{\left(890-15\right)}{35}=25\)