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(−125). 2. 45. (−8). 50
= [ (-125) . (-8) ] . [ 2. 50 ]. 45
= 1000 . 100 . 45
= 100000 . 45
= 4500000
Câu 1:
a) -8 + 5 = \(-3\)
b) -6 - 10 = \(-16\)
c) (-50) . (-9) \(=-450\)
d) (-45) : 9 \(=-5\)
e) 24 . 125 + 24 . 75 = 24 .( 125 + 75 ) = 24 . 200 = 4800
g) 42 - 7 . 25 = 42 - 175 = -133
h) (5-7) . 11 = -2 . 11 = -22
i) (-3 - 12) : (-5) = -15 : (-5) = 3
k) 3 . (-4)^2 + 2 . (-5) = 3. 16 + -10 = 48 + (-10 ) = 38
l) 125 . (-15) . 8 = -1875 . 8 = -15000
a, -8 + 5 = -3
b, -6 - 10 = -16
c, -50 . (-9) = 450
d, (-45) : 9 = -5
e, 24 . 125 +24 . 75 = 24. (125 + 75)
=24. 200 = 4800
g, 42 - 7 . 25 = 42 - 175
= -133
h, (5-7) . 11 = -2 .11
= -22
i, (-3 -12) : (-5) = (-15) : (-5)
= -3
k, 3 . \(\left(-4\right)^2\) + 2 . (-5) = 3 . 16 + (-10)
= 48 + (-10) = 38
l, 125 . (-15) . 8 = (125 . 8) .(-15)
= 1000 . (-15) = -15000
Tick cho mk nha!
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
1/\(\left(-12\right)\cdot46-12\cdot54=\left(-12\right)\cdot46+\left(-12\right)\cdot54\)
\(=\left(-12\right)\cdot\left(46+54\right)=\left(-12\right)\cdot100=-1200\)
2/\(3784+23-3785-15=3785+22-3785-15\)
\(=22-15=7\)
3/\(\left(-8\right)\cdot25\cdot\left(-2\right)\cdot4\cdot\left(-5\right)\cdot125\)
\(=\left[\left(-8\right)\cdot125\right]\cdot\left[25\cdot4\right]\cdot\left[\left(-5\right)\cdot\left(-2\right)\right]\)
\(=\left(-1000\right)\cdot100\cdot10=-1000000\)
4/\(19\cdot25+9\cdot95+19\cdot30=19\cdot\left(25+30\right)+9\cdot95\)
\(=19\cdot55+9\cdot95=95\cdot11+9\cdot95=95\cdot\left(11+9\right)=20\cdot95=1900\)
5/\(\left(-50+19+143\right)-\left(-79+25+48\right)\)
\(=\left(-50\right)+19+143+79-25-48\)
\(=118\)
6/\(\left(-25\right)\cdot\left(75-45\right)-75\cdot\left(45-25\right)\)
\(=\left(-25\right)\cdot30+\left(-25\right)\cdot3\cdot20\)
\(=\left(-25\right)\cdot\left(30+60\right)=\left(-25\right)\cdot90=-2250\)
7/\(\left(-37-17\right)\cdot\left(-9\right)+35\left(-9-11\right)\)
\(=\left(-54\right)\cdot\left(-9\right)+35\cdot\left(-20\right)\)
\(=486+\left(-700\right)=-214\)
8/\(\left(187-23\right)-\left(20-180\right)\)
\(=187-23-20+180=324\)
9/\(512\cdot2-128\cdot\left(-512\right)\)
\(=512\cdot2+128\cdot512=512\cdot\left(2+128\right)\)
\(=512\cdot130=66560\)
10/\(17\cdot\left(-25\right)+25\cdot21\)
\(=17\cdot\left(-25\right)-\left(-25\right)\cdot21=\left(-25\right)\cdot\left(17-21\right)\)
\(=\left(-25\right)\cdot\left(-4\right)=100\)
Chúc bạn học tốt.
1) (-12).46-12.54
=12.(-46)-12.54
=12.(-46-54)
=12.(-100)=(-1200)
10) 17.(-25)+25.21
= (-17).25+25.21
=25.(-17+21)
=25.4=100
( Mik đọc lướt qua thì thấy hai bài này dễ nên làm, chứ mấy bài kia chưa suy nghĩ gì, bạn tự làm nốt nhé!)
125.(-2).45.(-8).50
= [125.(-8)].[50.(-2)].45
= (-1000).(-100).45
= 100000.45
= 4500000
c.ơn nha