60%x + 2/3 x + x=680
\(60\%x+\frac{2}{3}x+x=680\)
\(60\%.x+\frac{2}{3}.x+3=680\)
\(\frac{3}{5}.x+\frac{2}{3}.x+x=680\)
\(\left(\frac{3}{5}+\frac{2}{3}+1\right).x=680\)
\(\frac{34}{15}\cdot x=680\)
\(x=680\div\frac{34}{15}\)
\(x=300\)
Vậy ...
tìm x 60% nhân x + 2/3 nhân + x = 680
hộ mik mik đang cần gấp nhé
mik cho mọi thứ bạn muốn
tìm x biết
a)680-(5x+60)=425
b){x-[5^2+(3^5-80.3)^3-51]^50+14}=20
Bài 1 : Tìm số tự nhiên x biết :
a)680-(5x+60)=425
b){x-[5^2+(3^5-80.3)^3-51]^50+14}=20
Tính nhanh:
a) 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
b) 583 x 931 + 69 x (170 + 583) + 31 x 170
c) 732 x 976 + 24 x (680 + 732) + 76 x 680
\(a,2\times31\times12+4\times6\times42+8\times27\times3\)
\(=24\times31+24\times42+24\times27\)
\(=24\times\left(31+42+27\right)\)
\(=24\times100\)
\(=2400\)
\(b,583.931+69.\left(170+583\right)+31.170\)
\(=583.931+69.170+69.583+31.170\)
\(=583.\left(931+69\right)+170.\left(69+31\right)\)
\(=583.1000+170.100\)
\(=583000+17000\)
\(=600000\)
\(c,732.976+24.\left(680+732\right)+76.680\)
\(=732.976+24.680+24.732+76.680\)
\(=732.\left(976+24\right)+680.\left(24+76\right)\)
\(=732.1000+680.100\)
\(=732000+68000\)
\(=800000\)
Học tốt
a)2400
b)600000
c)800000
a) 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3
= 24 x 31 + 24 x 42 + 24 x 27
= 24 x ( 31 + 42 + 27 )
= 24 x 100
= 2400
b) 583 x 931 + 69 x ( 170 + 583 ) + 31 x 170
= 583 x 931 + 69 x 170 + 69 x 583 + 31 x 170
= 583 x ( 931 + 69 ) + 170 x ( 69 + 31 )
= 583 x 1000 + 170 x 100
= 583000 + 17000
= 600000
c) 732 x 976 + 24 x ( 680 + 732 ) + 76 x 680
= 732 x 976 + 24 x 680 + 24 x 732 + 76 x 680
= 732 x ( 976 + 24 ) + 680 x ( 24 + 76 )
= 732 x 1000 + 680 x 100
= 732000 + 68000
= 800000
17*x +15*x*3 +12*15-x*4=680
17 x \(x\) + 15 x \(x\) x 3 + 12 x 15 - \(x\) x 4 = 680
\(x\) x ( 17 + 15 x 3 - 4) + 180 =680
\(x\) x ( 17 + 45 - 4) = 680 - 180
\(x\) x 58 = 500
\(x\) = 500/58
\(x\) = 250/29
17*x+15*{x*3}+12*{15-x*4}=680
17 x \(x\) + 15 x ( \(x\) x 3) + 12 x ( 15 - \(x\) x 4) = 680
17 x \(x\) + 45 x \(x\) + 12 x 15 - 12 x 4 x \(x\) = 680
17 x \(x\) + 45 x \(x\) + 180 - 48 x \(x\) = 680
\(x\) x ( 17 + 45 - 48) + 180 = 680
\(x\) x 14 = 680 - 180
\(x\) x 14 = 500
\(x\) = 500: 14
\(x\) = 250/7
\(17\times x+15\times\left(x\times3\right)+12\times\left(15-x\times4\right)=680\)
\(17\times x+45\times x+180-48\times x=680\)
\(x\times\left(17+45-48\right)+180=680\)
\(x\times14=500\)
\(x=\dfrac{500}{14}\)
\(x=\dfrac{250}{7}\)
b) 612 ⁝ x, 680 ⁝ x và x ≥ 35
Ta có: 612=22.32.17 ; 680= 5.17.23
Ta có: ƯCLN(612;680)= 22.17=68
Vậy: \(x\inƯ\left(68\right),x\ge35\Rightarrow x=68\)
Tìm x: x + 254 = 680