Tính nhanh:
a) 2.169.12-3.68.8-24
b) 2.56.24-3.36.16+.12.95-63.8.5
c) 57.41+50.57+43.27+73.43
e) 341.67+34.16+659.83
341.67+34.16+659.83
341.67+34.16+659.83
=22847+544+54697
=23391+54697
=78088
Tính nhanh
2.56.24-3.36.16+4.12.95-6.3.8.5
2.56.24 - 3.36.16 + 4.12.95 - 6.3.8.5
= 2.24.56 - 3.16.36 + 4.12.95 - 6.8.3.5
= 48.56 - 48.36 + 48.95 - 48.15
= 48.(56 - 36 + 95 - 15)
= 48.(20 + 80)
= 48.100
= 4800
2.56.24 - 3.36.16 + 4.12.95 - 6.3.8.5
= 2.24.56 - 3.16.36 + 4.12.95 - 6.8.3.5
= 48.56 - 48.36 + 48.95 - 48.15
= 48.(56 - 36 + 95 - 15)
= 48.(20 + 80)
= 48.100
= 4800
Tính nhanh:
a)38.105:5.38
b)2.169.12-3.68.8-24
c)(112+2.28-5.28):28
d)1448-(448+500)
a)38.105:5.38=(38:38).(105:5)
=1.21
=21
2.56.24-3.36.16+4.12.95-6.3.8.5
=48.56-48.36+48.95-48.15
=48.(56-36+95-15)
=48.100
=4800
2.56.24-3.36.16+4.12.95-6.3.8.5
=2.24.56-3.16.36+4.12.95-6.8.3.5
=48.56-48.36+48.95-48.15
=48.(56-36+95-15)
=48.100
=4800
2 . 56 . 24 - 3 . 36 . 16 + 4 . 12 . 95 - 6 . 3 . 8 . 5
= (2 . 24) . 56 - (3 . 16) . 36 + (4 . 12) . 95 - (6 . 8) . 15
= 48 . 56 - 48 . 36 + 48 . 95 - 48 . 15
= 48 . (56 - 36 + 95 - 15)
= 48 . 100
= 4800
~Std well~
#Jinyeon
2.169.12-3.68.8-24
=24.169-24.68-24.1
=24.(169-68-1)
=24.100
=2400
= 338.12 - 204.8 - 24
= 4056 - 1632 - 24
= 2424 - 24
= 2400
\(=2.12.169-3.8.68-24.1\)
\(=24.169-24.68-24.1\)
\(=24.\left(169-68-1\right)\)
\(=24.100\)
\(=2400\)
2.169.12-3.68.8-24+36.105-36.5
Tính nhanh 341.67+341.16+659.83
= 341 . ( 67 + 16 + 83 )
= 341 . 166
= 56606
=341.(67+16)+659.83
=341.83+659.83
=83.(341+659)
=83.1000
=83000
Tính bằng cách hợp lí
341.67+341.16+659.83
nhanh tick nha
341.67+341.16+659.83
= 341.(67+16)+659.83
=341.83+659.83
=83.(341+659)
=83.1000
=83000
341.67+341.16+659.83
=(341.67+341.16)+659.83
=341.(67+16)+659.83
=341.83+659.83
=83.(341+659)
=83.1000
=83000
\(341\cdot67+341\cdot16+659\cdot83\)
\(=341\cdot\left(67+16\right)+659\cdot83\)
\(=341\cdot83+659\cdot83\)
\(=83\cdot\left(341+659\right)\)
\(=83\cdot1000\)
\(=83000\)
Kết quả tính 341.67 + 341.16 + 659.83 là:
A. 83000
B. 65900
C. 34100
D. 8300
Đáp án cần chọn là: A
Ta có: 341.67+341.16+659.83=341.(67+16)+659.83=341.83+659.83=
=83.(341+659) =83.1000=83000.