19.27 + 47.81 + 19.20 =
19.27+47.81+19.20
19.27+47.81+19.20=513+3807+380=4700
19.27+47.81+19.20
= 19 . ( 20 + 27 ) + 47 . 81
= 19 . 47 + 47 . 81
= 47 . ( 19 + 81 )
= 47 . 100
= 4700
trả lời
19 . 27 + 47 . 81 + 19 . 20
= 19 .( 27 + 20 ) + 47 . 81
= 19 . 47 + 47 . 81
= 47 .( 19 + 81 )
= 47 . 100
= 47
# chúc bạn học tốt
136.23 + 136.17 – 40.36
l) 17.93 + 116.83 + 17.23
m) 19.27 + 47.81 + 19.20
n) 87.23 + 13.93 + 70.87
tính nhanh
a,19.27+47.81+19.20
b,87.23+13.93+70.87
a/ 19.27 + 47.81 + 19.20
= 19.(27 + 20) + 47.81
= 19.47 + 47.81
= 47.(19 + 81)
= 47 . 100
= 4700
b/ 87.23 + 13.93 + 70.87
= 87.(23 + 70) + 13.93
= 87.93 + 13.93
= 93.(87 + 13)
= 93 .100
= 9300
a.86.28
b.172.03
chúc học tốt! =))
136.23 + 136.17 – 40.36
l) 17.93 + 116.83 + 17.23
m) 19.27 + 47.81 + 19.20
n) 87.23 + 13.93 + 70.87
hãy giúp mình
Bài 7: Tính nhanh: a) 136.23 + 136.17 – 40.36 b) 17.93 + 116.83 + 17.23 b) 19.27 + 47.81 + 19.20 c) 87.23 + 13.93 + 70.87
a) \(136.23+136.17-40.36\)
\(=136.\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40\left(136+36\right)\)
\(=40.172\)
\(=6880\)
TÍNH NHANH:
a,29.87-29.23+64.71
b,19.27+47.81+19.20
c,87.23+13.93+70.87
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
a.65.35
b.86.28
c.172.03
chúc hok tốt! =))
Tính nhanh
d) 66.25 + 5.66 + 66.14 + 33.66
i) 136.23 + 136.17 – 40.36 e) 12.35 + 35.182 – 35.94
j) 17.93 + 116.83 + 17.23
m) 19.27 + 47.81 + 19.20
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
a,
58.75 + 58.50 - 58.25
= 58.(75 + 50 - 25)
= 58. (125 - 25)
= 58.100
= 5800
b, 27.39 + 27.63 - 2.27
= 27.(39 + 63 - 2)
= 27.(102 - 2)
= 27.100
= 2700
c, 128.46 + 128.32 + 128.22
= 128.(46 + 32 + 22)
= 128.(78 + 22)
= 128.100
= 12800
Tính nhanh:
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
Áp dụng công thức này là được :
m.a+m.b+m.c = m(a+b+c)
a) 58.75 + 58.50 - 58.25
= 58. (75 + 50 - 25)
= 58. 100
= 5800
b) 27.39 + 27.63 + 2.27
= 27. (39 + 63 - 2)
= 27. 100
= 2700
c) 128.46 + 128.32 + 128.22
= 128.(46 + 32 + 22)
= 128. 100
= 12800
d) 12.35 + 35.182 - 35.94
= 35.(12 + 182 - 94)
= 35. 100
= 3500
e) 48.19 + 48.115 + 134.52
= 48.(19 + 115) + 134.52
= 48.134 + 134.52
= 134.(48 + 52)
= 134.100
= 13400
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
h) 19.27 + 47.81 + 19.20
= 19.(27 + 20) + 47.81
= 19.47 + 47.81
= 47.(19 + 81)
= 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
#NgHn