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a) 66 . 25 + 5 . 66 + 66 . 14 + 33. 66
= 66 . ( 25 + 5 + 14 + 33 )
= 66 . 77
= 5082
b) 35 . 23 + 35 . 41 + 64 . 65
= 35 . ( 23 + 41 ) + 64 . 65
= 35 . 64 + 64 . 65
= 64 . ( 35 + 65 )
= 64 . 100
= 6400
c) 29 . 87 - 29 . 23 + 64 . 71
= 29 . ( 87 - 23 ) + 64 . 71
= 29 . 64 + 64 . 71
= 64 . ( 29 + 71 )
= 64 . 100
= 6400
66 x 25 + 5 x 66 + 66 x 14 + 33 x 66
= (25 + 5 + 14 + 33) x 66
= 77 x 66
= 5082
35 x 23 + 35 x 41 + 64 x 65
= [(23 + 41) x 35] + 64 x 65
= (64 x 35) + 4160
= 2240 + 4160
= 6400
29 x 87 - 29 x 23 + 64 x 71
= [(87 - 23) x 19] + 64 x 71
= (64 x 19) + 64 x 71
= 64 x 19 + 64 x 71
= (19 + 71) x 64
= 90 x 64
= 5760
\(=29.\left(87-23\right)+64.71=29.64+64.71=64.\left(29+71\right)=64.100=6400\)
a,29.(87-23)+64.71=29.64+64.71=64.(29+71)=64.100=6400
b,19.(27+20)+47.81=19.47+47.81=47.(19+81)=47.100=4700
c,87.(23+70)+13.93=87.93+13.93=93.(87+13)=93.100=9300
tick nha bạn
29.87-29.23+64.71
=29.(87-23)+64.71
=29.64+64.71
=64.(29+71)
=64.100
=6400
nhé bạn. *** mk nha
=29.87-23+71
=29.(87+23)-71
=29.110-71
=29.39
=1131
k cho minh nhe bạn
Tinh nhanh :
a) 5.23+35.41+64.65
=5.23+5.7.41+64.13.5
=5.(23+7.41+64.13)
=5.(23+287+832)
=5.(310+832)
=5.1142
=5710
1)
a) 35.23 + 35.41 + 64.65 = 35(23+41) + 64.65 = 35 . 65 + 64.65 =65. 99 = 65(100 - 1 ) = 6500 - 65 = 6435
b) 29.87 - 29.23 + 64.71 = 29(87-23) + 64.71 = 29.64 + 64.71 = 64(71+29) = 64.100= 6400
c) 48.19 + 48.115 + 134.52 = 48(19+115) + 134.52 = 48 . 134+134.52=134(52+48)=134.100=13400
d) 27.121 - 87.27 + 73.34 = 27(121-87) +73 .34 = 27 .34 + 73.34 = 34(73+27)=34.100=3400
e) 125.98-125.46-52.25 = 125(98-46) -52.25 = 125 . 52 - 52.25 =52(125-25) =52.100=5200
f)136.23 + 136.17 - 40.36 = 136(23+17) - 40.36 = 136.40 -40.36 = (136-36)40 = 100.40=4000
g) 17.93 + 116.83 + 17.23 = 17(93+23) + 116.83 = 17.116 + 116.83 =116(83+17) = 116.100=11600
h)19.27 +47.81 + 19.20 = 19(27+20) + 47.81 = 19. 47 + 47.81 = 47(81+19)=47.100 = 4700
i) 87.23 + 13.93 + 70.87 = 87(23+70) + 13.93 = 87 .93 + 13.93 = 93(87+13)=93.100=9300
2)Tìm x
a) [(6x-39):37].4 = 12
(6x - 39) : 37 = 12 : 4 = 3
x =(3.37 + 39): 6 = 25
b) ( x : 3 - 4 ) .5=15
x : 3 -4 = 3
x = (3+4).3 = 21
c) 128 - 3(x+4) =23
3x + 12 = 128 -23 = 105
x = (105-12):3 = 31
d) (3x - 34).73=2.74
3x - 81 = 2.74:73=2.7=14
x =(81 + 14 ) : 3= \(31\frac{2}{3}\)
e) x - [42 + (-28) ] = -8
x - 14 = -8
x- 14 + 14 = -8 + 14
x = 6
1. Tính nhanh:
a, 35.23+35.41+64.65
= 35. (23+41) +64.65
= 35. 64 + 64.65
= 64. ( 35 + 65 )
= 64 . 100
= 6400
b, 29.87 - 29.23 + 64.71
= 29.(87-23) + 64.71
= 29.64 + 64.71
= 64.(29 + 71)
= 64.100
= 6400
c, 48.19 + 48.115 + 134.52
= 48.(19 + 115) + 134.52
= 48.134 + 134.52
= 134.(48 + 52)
= 134.100
= 13400
d, 27.121 - 87.27 + 73.34
= 27.(121 - 87) + 73.34
= 27.34 + 73.34
= 34.(27 + 73)
= 34.100
= 3400
e, 125.98 - 125.46 - 52.25
= 125.(98 - 46) - 52.25
= 125.52 - 52.25
= 52.(125 - 25)
= 52.100
= 5200
f, 136.23 + 136.17 - 40.36
= 136.(23 + 17) - 40.36
= 136.40 - 40.36
= 40.(136 - 36)
= 40.100
= 4000
g, 17.93 + 116.83 + 17.23
= 17.(93+23) + 116.83
= 17.116 + 116.83
= 116.(17 + 83)
= 116.100
= 11600
Lát nữa mình làm tiếp, giờ mình phải đi học rồi
a) 35.23+35.41+64.65
=35*(23+41)+64*65
=35*64+64*65
=64*(35+65)
=64*100
=6400
b)29.87-29.23+64.71
=29*(87-23)+64*71
=29*64+64*71
=64*(29+71)
=64*100
=6400