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)42.53+47.156-47.114
b)35.13+35.17+65.75-65.45
c)53.39+47.39-53.21-47.21
d)36.28+36.82+64.69+64.41
e)78.31+78.24+78.17+22.72
\(a,\)\(42.53+47.156-47.114\)
\(42.53+47\left(156-114\right)\)
\(=42.53+47.42\)
\(=42\left(53+47\right)\)
\(=42.100\)
\(=4200\)
\(b,\)\(35.13+35.17+65.75-65.45\)
\(=35\left(13+17\right)+65\left(75-45\right)\)
\(=35.30+65.30\)
\(=30\left(35+65\right)\)
\(=30.100\)
\(=3000\)
a)42.53+47.156-47.114
= 42.53+47(156-114)
=42.53+47.42
=42(53+47)=42.100=4200
b)35.13+35.17+65.75-65.45
=35(13+17)+65(75-45)
=35.30+65.30
=30(35+65)
=30.100=3000
Tính nhanh :
a) 37.75+37.45+63.67+63.53
b) 42.18+42.52+58.70
c) 3.15.8+4.6.37+2.38.42
( ai giải xong trước mình tick cho )
a) 37.75+37.45+63.67+63.53
= 37.(75 + 45) + 63.(67 + 53)
= 37 . 120 + 63 . 120
= 120 . (37 + 63)
= 120 . 100
= 12 000
tinh nhanh 78.31+22.72+78.24+78.17
78.31+22.72+78.24+78.17
=78.(31+24+17)+22.72
=78.72+22.72
=(78+22).72
=100.72
=7200
78.31+22.72+78.24+78.17
=78.(31+24+17)+22.72
=78.72+22.72
=(78+22).72
=100.72
=7200
78.31+22.72+78.24+78.17
=78.(31+24+17)+22.72
=78.72+22.72
=(78+22).72
=100.72
=7200
a,19991999.1998-19981998.1999=?
b,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
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
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
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
Tính nhanh:
a) (2020+315)-2020
b) 59.74+59.29
c) 35.34+35.86+65.75+65.45
d) 1+2+3...+100
Các bạn giúp mình trả lời câu hỏi này với, mình đang cần gấp ,ai làm nhanh nhất mình tick cho nha!!!!!!!!!!!!!!!