Tìm x: X x125=32250 ;39975:X=123
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\(\frac{120\times999+120}{2\times4\times0,8\times5\times2,5\times125}\)
\(=\frac{120\times1000}{\left(125\times0,8\right)\left(4\times2,5\right)\left(2\times5\right)}\)
\(=\frac{120000}{100\times10\times10}\)
\(=\frac{120000}{10000}\)
\(=\frac{12}{1}=12\)
(-64) . 125 = x3
=> \(\left(-4\right)^3.5^3=x^3\)
=> \(\left(-4.5\right)^3=x^3\)
=> \(\left(-20\right)^3=x^3\)
=> x = -20
=> -5x0 = \(-5.\left(-20\right)=100\)
4 × 125 × 25 × 8
= (4 × 25) × (125 × 8)
= 100 × 1000
= 100 000
2 × 8 × 50 × 25 × 125
= (2 × 50) × (8 × 125) × 25
= 100 × 1000 × 125
= 12 500 000
2 × 3 × 4 × 5 × 50 × 25
= (2 × 50) × (4 × 25) × (3 × 5)
= 100 × 100 × 15
= 150 000
25 × 20 × 125 × 8 - 8 × 20 × 5 × 125
= 8 × 125 × 20 × (25 - 5)
= 1000 × 20 × 20
= 400 000
- (25 x 4) x (125 x8)=100 x 1000 =100000
- (50 x 2) x (8 x 125) x 25=100 x 1000 x 25 =2500000
- (2 x 50 ) x (4 x 25) x (3 x5)=100 x 100 x 15=150000
- 25 x 20 x125 x 8 - 5
= (20 x 5) x (125 x 8) -25=100 x 1000 -5 =100000 - 5 =99995
a) \(x.125=32250\)
\(x=32250:125\)
\(x=258\)
b) \(39975:x=123\)
\(x=39975:123\)
\(x=325\)
\(x\times125=32250\)
\(\Rightarrow x=258\)
_____
\(39975:x=123\)
\(\Rightarrow x=325\)