75 x 8 x 16 x125
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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
\(\dfrac{8\times3\times4}{16\times3}=\dfrac{8\times3\times2\times2}{2\times8\times3}=2.\\ \dfrac{30\times25\times7\times8}{75\times8\times12\times14}=\dfrac{5\times2\times3\times5\times5\times7\times8}{3\times5\times5\times8\times2\times2\times3\times2\times7}=\dfrac{5}{12}.\)
8 x 75 x 3 + 6 x 25 x 4 - 240
___________________________
15 x 2 x 6 + 18 x 16 x5
= 24 x 75 + 24 x 25 - 240 x 10
_________________________
3 x 5 x 2 x 6 + 3 x 6 x 2 x 8 x5
= 24 x (75 + 24 -10)
_________________
3x5x2x6x ( 1+8)
= 24 x 9 x 10 4
_________= ___
18 x 10 x 9 3
https://hoc24.vn/cau-hoi/8-x-75-x-3-6-x-25-x-4-240-15-x-2-x-6-18-x-16-x5tinh-nhanh.5861050326868
8 x 75 x 3 + 6 x 25 x 4 - 240
___________________________
15 x 2 x 6 + 18 x 16 x5
= 24 x 75 + 24 x 25 - 240 x 10
_________________________
3 x 5 x 2 x 6 + 3 x 6 x 2 x 8 x5
= 24 x (75 + 24 -10)
_________________
3x5x2x6x ( 1+8)
= 24 x 9 x 10 4
_________= ___
18 x 10 x 9 3
a) 31 - ( 16 + 31 ) = x - ( 45 - 75 )
31 - 16 - 31 = x - 45 + 75
-16 = x + 30
x = -46
b) 9 - 45 = ( 8 - x ) - ( 35 + 8 )
-36 = 8 - x - 35 - 8
-36 = -x - 35
-x = -1
x = 1
1200000
Bằng 1200000 nhé!