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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
125-(30+x+125)=(x-237).[8+(-237)]
125-(30+x+125)=(x-237)×(-229)
125-(30+x+125)=x-237×(-229)
125-(30+x+125)=x-(-54273)
125-(30+x+125)=x+54273
125-30+x+125=x+54273
125-39+x=x+54273-125
125-39+x=x+54148
125-x=x+54148-39
125-x=x+54109
125-1x=1x+54109
125-1x=0
1x=125-0
1x=125
x=125÷1
x=125
\(\text{ -125 x (-8) + (-15) x 20}\)
\(=1000+\left(-300\right)\)
\(=700\)
a) \(\left(-4\right)\left(-3\right)\left(-125\right).25.\left(-8\right)=\left[25\left(-4\right)\right]\left[\left(-125\right)\left(-8\right)\right]\left(-3\right)\)
\(=\left(-100\right).1000.\left(-3\right)=300.1000=300000\)
b) \(\left(-4\right).9\left(-125\right).25.\left(-8\right)=\left[25\left(-4\right)\right]\left[\left(-125\right)\left(-8\right)\right].9\)
\(=\left(-100\right).1000.9=\left(-100\right).9000=-900000\)
c) \(7.\left(-25\right)\left(-3\right).2.\left(-4\right)=\left[\left(-25\right)\left(-4\right)\left(-3\right)\right].7.2=-4200\)
d) \(\left[93-\left(20-7\right)\right]\div16=\left(93-13\right)\div16=80\div16=5\)
e) \(53-\left(-51\right)+\left(-53\right)+49=\left(53-53\right)+\left(51+49\right)=100\)
f) \(168-49+\left(-68\right)+4=168-49-68+4=55\)
Bổ sung đề : Tính :
\(20.\left(-57\right).125.5.\left(-8\right)\)
\(=\left(20.100\right).\left(-57\right).\left[125.\left(-8\right)\right]\)
\(=100.-57.-1000\)
\(=5700000\)
15 x 6 x 4 x 125 x 8
= (15 x 4) x (125 x 8) x 6
= 60 x 1000 x 6
= 60000 x 6
= 360000
15 x6x4x125x8
= (15x4)x6x(125x8)
= 60x6 x 1000
= 360 x 1000
= 360 000
\(8\cdot\left(-125\right)=-\left(8\cdot125\right)=-1000\)
8 x (-125) = -(8 x 125) = -1000