tinh nhanh 78.31+22.72+78.24+78.17
78.31+78.24+78.17+22.72 = ?
=78.(31+24+17)+22.72
=78.72+22.72
=72.(78+22)
=72.100
=7200
l.i.k.e mình nha ngo anh tu
78 . 31 + 78 . 24 + 78 . 17 + 22 . 72
= 78 . (31 + 24 + 17) + 72 . 22
= 78 . 72 + 72 . 22
= 72 . (78 + 22)
= 72 . 100
= 7200
TL:
78 . 31 + 78 . 24 + 78 . 17 + 22 . 72
= 78 . (31 + 24 + 17) + 72 . 22
= 78 . 72 + 72 . 22
= 72 . (78 + 22)
= 72 . 100
= 7200
HT
78.31+78.24+78.17+22.72 = ?
78.31+78.24+78.17+22.72
=78.(31+24+17)+22.72
=78.72+22.72
=72.(78+22)
=72.100
=7200
= 78.(31+24+17)+22.72
= 78.72+22.72
= 72.(78+22)
= 72.100
=7200
a)37.75+37.45+63.67+63.53
b)35.34+35.86+65.75+65.45
c)78.31+78.24+78.17+22.72
làm nhanh giúp mình với
a) 37.75+37.45+63.67+63.53
= 37.(75+45)+63.(67+53)
= 37.120+63.120
= 120.(37+63)
= 120.100
= 12000
b) 35.34+35.86+65.75+65.45
= 35.(34+86)+65.(75+45)
= 35.120+65.120
=120.(35+65)
= 120.100
= 12000
c) 78.31+78.24+78.17+22.72
= 78.(31+24+17)+22.72
= 78.72+22.72
= 72.(78+22)
= 72.100
= 7200
b) 35⋅34+35⋅86+65⋅75+65⋅45=35(34+86)+65(75+45)=35⋅120+65⋅120=(35+65)⋅120=100⋅120=12000
c) 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72
= 78 . ( 31 + 24 + 17 ) + 22 . 72
= 78 . 72 + 22 . 72
= 72 . ( 78 + 22 )
= 72 .100
= 7200
chúc bạn học tốt ❤❤❤
b) 35 . 34 + 35 . 86 + 65 . 75 + 65 . 45
= 35 . ( 34 + 86 ) + 65 . ( 75 + 45 )
= 35 . 120 + 65 . 120
= ( 35 + 65 ) . 120
= 100 . 120
=12000
c) 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72
= 78 . ( 31 + 24 + 17 ) + 22 . 72
= 78 . 72 + 22 . 72
= 72 . ( 78 + 22 )
= 72 . 100
= 7200
chúc bạn học tốt
a,19991999.1998-19981998.1999=?
b,78.31+78.24+78.17+22.72=?
78.31+78.24+78.17+22.72
tính bằng cách thuận tiện
Ta có: 78.31+78.24+78.17+22.72
= 78.(31 + 24 + 17) + 22.72
= 78 .72 + 22.72
= 72.(78 + 22)
= 72. 100
= 7200
= 78.(31+24+17)+22.72
= 78.72+22.72
= 72.(78+22)
= 72.100
= 7200
78.31+78.24+78.17+22.72
tính bằng 2 cách nha mk cần gấp
C1 : 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72
= 78 ( 31 + 24 + 17 ) + 22 . 72
= 78 . 72 + 22 . 72
= ( 78 + 22 ) . 72
= 100 . 72
= 7200
C2 : 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72
= 2418 + 1872 + 1326 + 1584
= 7200
\(78.31+78.24+78.17+22.72.\)
\(=78.\left(31+24+17\right)+22.72\)
\(=78.72+22.72\)
\(=72.\left(78+22\right)\)
\(=72.100=7200\)
C1:
78.31+78.24+78.17+22.72
= 78.(31+24+17)+22.72
= 78.72+22.72
= 72.(78+22)
=72.100
=7200
C2:
78.31+78.24+78.17+22.72
= 2418+78.24+78.17+22.72
= 2418+1872+78.17+22.72
= 2418+1872+1326+22.72
=2418+1872+1326+1584
= 4290+1326+1584
= 5616+1584
= 7200
tính nhanh
a) -78.31-78.24-78.17+22.72
b) -15,5.20,8+3,5.9,2-15,5.9.2+3.5.20,8
a, -78(31+24+17)+22.72=-78.72+22.72=72.(-78+22)=-4032
b, -15,5.(20,8+9,2)+3,5.(9,2+20,8)=(-15,5+3,5).(20,8+9,2)=-12.30=-360
Áp dụng tính chất phân phối của phép nhân đối với phép cộng để tính l:
78.31+78.24+78.17+22.72
78.31+78.24+78.17+22.72
= 78 .(31+24+17)+22.72
= 78 . 72 +22.72
= 72 .(78+22)
= 72 . 100
= 7200
\(78.31+78.24+78.17+22.72\)
\(=78.\left(31+24+17\right)+22.72\)
\(=78.72+22.72\)
\(=72.\left(78+22\right)=72.100=7200\)
Tính
2665 :[213-(17-9)]
78.31+78.24+78.17+22.72
3^6:3^2+2^3.2^2-(17-9)^2