1.
a. 17.93+116.83+17.23
1.
a. 17.93+116.83+17.23
b. 15.78.98.76
c. 65-89+87.9.5
a.17.93+116.83+17.23
=1581+9628+391
=11600
b.15.78.98.76
=1170.98.76
=114660.76
=8714160
c.65-89+87.9.5
=65-89+3915
=(65+(89))+3915
=3891
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
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 hợp lý
136.23 + 136.17 - 40.36
17.93+ 116.83 +17.23
\(136\cdot23+136\cdot27-40\cdot36\)
\(=136\cdot\left(23+17\right)-40\cdot36\)
\(=136\cdot40-40\cdot36\)
\(=40\cdot\left(136-36\right)\)
\(=40\cdot100=4000\)
\(17\cdot93+116\cdot83+17\cdot23\)
\(=17\cdot\left(93+23\right)+116\cdot83\)
\(=17\cdot116+116\cdot83\)
\(=116\cdot\left(17+83\right)\)
\(=116\cdot100=11600\)
\(136.23+136.17-40.36\)
\(=136.\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40.\left(136-36\right)\)
\(=40.100\)
\(=100\)
\(17.93+116.83+17.23\)
\(=17.\left(93+23\right)+116.83\)
\(=17.116+116.83\)
\(=116\left(17+83\right)\)
\(=116.100\)
\(=11600\)
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
Tính hợp lí:
a) 17.93+116.83+17.23
b)125.98-125.46-52.25
a) 17.93+116.83+17.23
=(17.93+17.23)+116.83
=17.(93+23)+116.83
=17.116+116.83
=116.(17+83)
=116.100
=11600
b) 125.98-125.46-52.25
=(125.98-125.46)-52.25
=125.(98-46)-52.25
=125.52-52.25
=52.(125-25)
=52.100
=5200
tk nha!
a) 17 . 93 + 116 . 83 + 17 . 23
= ( 17 . 93 + 17 . 23 ) + 116 . 83
= 17 . ( 93 + 23 ) + 116 . 83
= 17 . 116 + 116 . 83
= 116 . ( 17 + 83 )
= 116 . 100
= 11600
17.93+116.83+17.23
Giải chi tiết ra giùm mik nha , Ai nhanh mik tik cho .
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
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