Tính nhanh: 500 x 4 x 2 x 25 - 500 x 3 x 2 x 30
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500x6+500x4-108:12:9
=500x(6+4)-9:9
=500x10-1
=5000-1
=4999
9782x35-9782x25+1000:5:2
=9782x(35-25)+200:2
=9782x10+100
=97820+100
=97920
37800:25:4+57+467x43
=1512:4+57+20081
=378+57+20081
=435+20081
=20516
a) 4.25-12.5+170:10
=100-60+17
=40+17
=57
b) (7+33:32).4-3
=(7+3).4-3
=10.4-3
=40-3
=37
c) 12:{400:[500-(125+25.7)]}
=12:{400:[500-(125+175)]}
=12:{400:[500-300]}
=12:{400:200}
=12:2
=6
d) 168+{[2.(24+32)-2560]:72}
=168+{[2.(16+9)-1]:49}
=168+{[2.25-1]:49}
=168+{[50-1]:49}
=168+{49:49}
=168+1
=169
a,
36 x 40 = (36 x 4) x 10 = 144 x 10 = 1 440
72 x 60 = (72 x 6) x 10 = 432 x 10 = 4 320
89 x 50 = (89 x 5) x 10 = 445 x 10 = 4 450
b,
450 x 70 = (45 x 7) x 100 = 315 x 100 = 31 500
2300 x 500 = (23 x 5) x 10 000 = 115 x 10 000 = 1 150 000
17 000 x 30 = (17 x 3) x 10 000 = 510 000
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+30\right)=500\)
Số lượng số hạng là: \(30-1+1=30\)
\(\Rightarrow30x+\dfrac{30\left(30+1\right)}{2}=500\)
\(30x+465=500\)
\(30x=35\)
\(x=\dfrac{7}{6}\)
\(\left(x+1\right)+\left(x+2\right)+...+\left(x+30\right)=500\)
\(\Rightarrow x+1+x+2+..+x+30=500\)
\(\Rightarrow\left(x+x+...+x\right)+\left(1+2+...+30\right)=500\)
\(\Rightarrow30\cdot x+465=500\)
\(\Rightarrow30\cdot x=500-465\)
\(\Rightarrow30\cdot x=35\)
\(\Rightarrow x=\dfrac{35}{30}\)
\(\Rightarrow x=\dfrac{7}{6}\)
\(a,\left(3x-17\right)4^2=4^3\)
\(3x-17=4\)
\(3x=21\)
\(x=7\)
\(b,5x-18=-3\)
\(5x=15\)
\(x=3\)
\(c,\hept{\begin{cases}x⋮12\\x⋮25\\x⋮30\end{cases}}\)\(\Rightarrow x\in B\left(12;25;30\right)\)
rồi tìm , lâu , quên =>> tìm BC xog thì xét ĐK rồi KL
\(\text{a) (3x - 17) . 4^2= 4^3}\)
\(\Rightarrow3x-17=4^3:4^2=4\)
\(\Rightarrow3x=4+17=21\)
\(\Rightarrow x=7\)
\(\text{b) 5x - 18 = -3}\)
\(\Rightarrow5x=-3+18=15\)
\(\Rightarrow x=15:5=3\)
c) x chia hết cho 12; x chia hết cho 25; x chia hết cho 30 và 0 < x< 500.
\(\Rightarrow x⋮12,x⋮25,x⋮30\)
\(\Rightarrow x\in BC\left(12,15,30\right)=30\)
\(\Rightarrow x\in\left\{0,30,60,90,120,150,...,480,....\right\}\)
Mà 0<x<500
\(\Rightarrow x\in\left\{30,60,90,120,150,...,480\right\}\)
học tốt
t.i.k nha
\(BCNN\left(12;25;30\right)=300\)
\(\Rightarrow x=300\) ( t/m điều kiện )
`=> x in BC(12, 25, 30)`.
Ta có: `12 = 2^2 xx 3`.
`25 = 5^2`.
`30 = 5 xx 2 xx 3`.
`=> x in B(300)`.
`=> x in {0, 300, 600, ...}` mà `0 <= x <= 500`
`=> x = 0, 300`.
500 × 4 × 2 × 25 - 500 × 3 × 2 × 30
= 500 × (4 × 2 × 25) - 500 × (3 × 2 × 30)
= 500 × 200 - 500 × 180
= 500 × (200 - 180)
= 500 × 20
= 10000