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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
a) 5 . 125 . 2 . 41 . 8
= (5 . 8) . (125 . 2) . 41
= 40 . 250 . 41
= 10 000 . 41
= 410 000
b) 25 . 7 . 10 . 4
= (25 . 4 ) . (10 . 7)
= 100 . 70
= 7000
Chúc bạn học tốt!! ^^
a,5.125.2.41.8=(125.8).(2.5).41=1000.10.41=410000
b,25.7.10.4=(25.4).70=100.70=7000
c,8.12.125.2=(8.125).12.2=100.24=2400
d,4.36.25.50=(4.25).(2.50).18=100.100.18=180000
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
a, ( -4 ).125.( -25 ).( -8 ).( -6 )
= [ ( -4 ).( -25 ) ].[ 125.( -8 ) ].( -6 )
= 100.( -1000 ).( -6 )
= ( -100 000).( -6 )
= 600 000
b, ( -2 ).12.( -50 )
= [ ( -2 ).( -50 ) ].12
= 100.12 = 1200
c, ( -25 ).( - 26 ).( - 4 )
= [ ( -25 ).( -4 ) ].( - 26 )
= 100.( -26 ) = -2600
a) (-4) . 125 . (-25) . (-8) . (-6)
= (-4). (-25) . 125 . (-8) - (-6)
= 100 . (-1000) . (-6)
= -100000 . (-6)
=600000
= ( 2 x 50 ) x ( 4 x 25 ) x ( 8 x 125) x 3
= 100 x 100 x 1000 x 3
= 30000000
Tk mk nha
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, 410. 230=220.230=250
b,925.274.813= 350.312.312=374
Tương tự các câu khác....
a, 410.230 = (22)10.230 = 220.230 = 250
b, 925.274.813 = (32)25.(33)4.(34)3 = 350.312.312 = 374
c, 2550.1255 = (52)50.(53)5 = 5100.515 = 5115
d, 643.48.164 = (26)3.(22)8.(24)4 = 218.216.216 = 250
e, 38 : 36 = 32
210 : 83 = 210 : (23)3 = 210 : 29 = 2
127 : 67 = (12 : 6)7 = 27
@Dương Tuyết Mai
a) 4x125x25x8
= (4x25)x(125x8)
= 100 x 1000
= 100000.
b) 2x3x4x5x50x25
= (2x50)x(4x25)x(3x5)
= 100 x 100 x 15
= 10000 x 15
= 150000.
c) 8x3x427+6x573x4
= (8x3)x427+(6x4)x573
= 24 x427+ 24 x573
= 24x (427+573)
= 24x 1000
= 24000.
Ủng hộ nha.
a, 4 x 125 x 25 x 8
= (4 x 25) x (125 x 8)
= 100 x 1000
= 100000
b, 2 x 3 x 4 x 5 x 50 x 25
= (2 x 50) x (4 x 25) x (3 x 5)
= 100 x 100 x 15
= 150000
c, 8 x 427 x 3 + 6 x 573 x 4
= 8 x 3 x 427 + 6 x 4 x 573
= 24 x 427 + 24 x 573
= 24 x (427 + 573)
= 24 x 1000
= 24000
Ủng hộ mk nha ^_-