Tính nhanh
47.69-31.(-47)
(-32).125.(-9).(-25)
tính nhanh:
a) -4.2.6.25.(-7).5
b) 47.69-31.(-47)
c) 16.(38-2)-38.(16-1)
d) (-41).(59+2)+59.(41-2)
e) A=19.25+9.95+38.15
f) B= (-32).125.(-9).(-25)
g) C=(-3879-3879-3879-3879).(-25)
h) D=369.(-2)-41.72
tính hợp lí các phép tính sau:
a)-4.2.6.25.(-7).5
b)47.69-31.(-47)
c)-310.87+310.(-13)
d)(-32).125.(-9).(-25)
e)6.(-2)3+5.(-4)+5.(-4)-(-12)
f)(-3879-3879-3879-3879).(-25)
Tính nhanh
a) (x-8).14-125
b) (-125).(-72).7
c) (-4).2.6.25-(-7).5
d) -310.87+(-310).13
e) 47.69-31.(-47)
f) 42.48-24.34
a)-524. [23+(-45)+524.(-45+123)
b) 47.69-31.(-47)
c)16.(38-2)-38.(10.1
d)125.(-8).(-25).9.4.100^0 .3
) 47.69-31.(-47)
b) 16.( 38 -2 ) - 38.( 16 -1 )
c) (-41).( 59+2 ) + 59 .( 41 -2 )
d)125.(-8).(-25).9.4.1000 :3
a) \(47.69-31\left(-47\right)=47-69-\left(-31\right).47\)
\(=47.69+31.47=47.\left(69+31\right)=47.100=4700\)
b) \(16\left(38-2\right)-38\left(16-1\right)=16.38-16.2-38.16-\left(-38\right).1\)
\(=\left(16.38-38.16\right)-32+38=0-32+38=6\)
c) \(\left(-41\right)\left(59-2\right)+59\left(41-2\right)\) \(=\left(-41\right).59-\left[\left(-41\right).2\right]+59.41-59.2\)
\(=\left[\left(-41\right).59+59.41\right]-\left[\left(-49\right).2-51.2\right]=0-\left(-100\right).2=200\)
d) \(125.\left(-8\right)\left(-25\right)9.4.1000\div3=125.200.9.4.1000\div3\)
\(=\left(125.4\right)\left(9\div3\right)\left(200.1000\right)=500.3.200000=300000000\)
a)-524 . [(23+(-45)]+524.(-45+123)
b)47.69-31.(-47)
c)16.(38-2)-38.(16-1)
d) (-41).(59+2)+59.(41-2)
e) 125.(-8).(-25).9.4.100^0 :3
a) \(-524\cdot\left[23+\left(-45\right)\right]+524\cdot\left(-45+123\right)\)
\(=-524\cdot\left[\left(23-45\right)-\left(-45+123\right)\right]\)
\(=-524\cdot\left(23-45+45-123\right)\)
\(=-524\cdot-100\)
\(=52400\)
b) \(47\cdot69-31\cdot\left(-47\right)\)
\(=-47\cdot\left(-69-31\right)\)
\(=-47\cdot-100\)
\(=4700\)
c) \(16\left(38-2\right)-38\left(16-1\right)\)
\(=16\cdot38-16\cdot2-38\cdot16+38\)
\(=-16\cdot2+38\)
\(=-36+38\)
\(=2\)
d) \(\left(-41\right)\cdot\left(59+2\right)+59\cdot\left(41-2\right)\)
\(=-41\cdot59-41\cdot2+41\cdot59-2\cdot59\)
\(=-41\cdot2-2\cdot59\)
\(=-2\left(41+59\right)\)
\(=-2\cdot100\)
\(=-200\)
e) \(25\cdot\left(-8\right)\cdot\left(-25\right)\cdot9\cdot4\cdot100^0:3\)
\(=\left(-1000\right)\cdot\left(-25\right)\cdot9\cdot4\cdot1:3\)
\(=25000\cdot9\cdot4:3\)
\(=25000\cdot3\cdot4\)
\(=100000\cdot3\)
\(=300000\)
a) 47.69-31.(-47)
Tính nhanh nha <3
\(=47\cdot69-31\cdot\left(-47\right)\\ =47\cdot69+31\cdot47\)
\(=47\cdot\left(69+31\right)\)
\(=47\cdot100\\ =4700\)
47 . 69 - 31 . ( - 47 )
= 47 . 69 + 31 . 47
= 47 . ( 69 + 31 )
= 47 . 100
= 4700
=4700 nha
HT
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thực hiện cách phép tính hợp lý nếu có thể
a)47.69-31(-47)
b)(-14)(-25)+25 (-11)
a, 47.69-31(-47)
=47(69+31)
=47.100
4700
b,(-14)(-25)+25(-11)
=14.25+25(-11)
=25(14-11)
=25.3=75
Bài 1 : Tính nhanh :
a) (-8).14.225
b) (-125).(-72).7
c) 47.69-31.(-47)
d) -4.2.6.25.(-7).5
e) -310.87+(-310).13
g) 42.48 -24.34
Giúp mình nha >_< !!!
a) ( -8) .14 . 225 = - ( 8 .14.225)= -25200
b) ( -125 ) . (-72 ) = 125.72.7= 9000.7=63000
c) 47.69 - 31 - ( -47 )= 47.(69+31)=4700
mình giải được đến đó thôi
a,-25200
b,63000
c,4700
d,42000
e,-31000
g,1200
c) 47.69-31.(-47)
= 47.(-69)-31.47
=47.(-69-31)=47.-100= -4700