125.(-2).45.(-8).50 helpp
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1 : Tính nhanh:
a) 2376 + 3425 - 376 - 425 = ( 2376 - 376 ) + ( 3425 - 425 )
= 2000 + 3000
= 5000
b)4638 - 2437 + 5362 - 7563 = 2210 + ( - 2210 )
= 0
c) 45 + 45 + 45 + 45 + 15 + 15 + 15 + 15
= 45 x 4 + 15 x 4
= ( 45 + 15 ) x 4
= 60 x 4
= 240
d) 4 x 125 x 25 x 8 = ( 4 x 25 ) x ( 125 x 8 )
= 100 x 1000
= 100000
e) 2 x 8 x 50 x 25 x 125 = ( 2 x 50 ) x ( 8 x 125 ) x 25
= 100 x 1000 x 25
= 100000 x 25
= 2500000
2 : Tính nhanh bằng 2 cách:
C1 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
= ( 125 - 25 ) + ( 125 - 25) + ( 125 - 25 ) + ( 125 - 25 )
=100 + 100 + 100 + 100
= 100 x 4
= 400
C2 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
= 125 x 4 - 25 x 4
= ( 125 - 25 ) x 4
= 100 x 4
= 400
(−125). 2. 45. (−8). 50
= [ (-125) . (-8) ] . [ 2. 50 ]. 45
= 1000 . 100 . 45
= 100000 . 45
= 4500000
134415 - 134415 : 45 = 134415 - 2987
= 131428
325 * 1574 - 325 * 325 - 325 * 249 = 325 * ( 1574 - 325 - 249 )
= 325 * 1000
= 325000
2 * 8 * 50 * 25 * 125 = ( 2 * 50 ) * 125 * ( 8 * 25 )
= 100 * 125 * 200
= 12500 * 200
= 2500000
2 * 3 * 4 * 5 * 50 * 25 = ( 2 * 50 ) * ( 5 * 4 ) * ( 4 * 25 ) * 3
= 100 * 20 * 100 * 3
= 100 * ( 20 * 3 )
= 100 * 60
= 6000
a: =234x(45+54+1)
=234x100
=23400
b: =(8x125)x(50x20)
=1000x1000
=1000000
a = 243x(45+54+1)
=243 x 100
=24300
b = (20 x 50 ) x (8x125)
=1000x1000
=1000000
a.35 x 34 + 35 x 38 + 65 x 75 + 45 x 65
= 35 x (34 + 38) + 65 x 75 + 65 x 45
= 35 x 72 + 65 x (75+45)
= 35 x 72 + 65 x 120
= 35 x 72 + 65 x (72 + 48)
= 35 x 72 + 65 x 72 + 65 x 48
= (35+65) x 72 + 65 x 48
= 100 x 72 + 65 x 48
= 7200 + 3120
= 10320
b.39 x 8 + 60 x 2 + 21 x 8
=39 x 8 + 15 x 4 x 2 +21 x 8
= 39 x 8 + 15 x 8 + 21 x 8
=(39 + 15 + 21) x 8
= 75 x 8
= 600
c.58 x 75 + 58 x 50 - 58 + 25
= 58 x 75 + 58 x 50 - 58 x 1 + 25
= 58 x(75+50-1)+25
= 58 x 124 + 25
= 7192 + 25
= 7217
d.125 x 98 - 125 x 46 - 52 x 25
= 25 x 5 x 98 - 25 x 5 x 46 - 25 x 52
= 25 x 490 - 25 x 230 - 25 x 52
= 25 x (490 - 230 - 52)
= 25 x 208
= 5200
a: =1250:25=50
b: =234(45+55)+234=23400+234=23634
c: =1000x1000=1000000
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!
125.(-2).45.(-8).50
= [125.(-8)].[50.(-2)].45
= (-1000).(-100).45
= 100000.45
= 4500000
c.ơn nha