45+36+78+54+64+22+36
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\(a.12\times125\times54\)
\(=1500\times54\)
\(=81000\)
\(b.64\times125\times54\)
\(=8000\times54\)
\(=432000\)
\(c.36\times\left[143+57\right]+64+\left(143+57\right)\)
\(=36\times200+64+200\)
\(=7200+64+200\)
\(=7264+200\)
\(=7464\)
a)36+54+64
=(36+64)+54
=100+54
=154
b)79+63+22
=78+1+63+22
=(78+22)+(63+1)
=-100+64
=164
k mik nha
a) 36+54+64
= (36+64)+54
= 100+ 54
= 154
b) 79+63+22
= 79+(63+22)_
=79+85
=164
36 . 64 + 18 . 64 + 36 . 54
=(36+18)x64+36x54
=54x64+36x54
=(64+36)x54
=100x54
=5400
36. 64 + 18 . 64 + 36 . 54
= ( 36 + 18 ) . 64 + 36 . 54
= 54 . 64 + 36 . 54
= ( 54 + 36 ) . 54
= 100 .54
=5400
a, \(120\cdot15+12\cdot470+12\cdot38\cdot10\)
\(=12\cdot10\cdot15+12\cdot47\cdot10+12\cdot38\cdot10\)
\(=120\left(15+47+38\right)=120\cdot100=12000\)
f,\(\left(2+4+6+...+100\right)\cdot\left(36\cdot333-111\cdot108\right)\)
\(=\left(2+4+6+...+100\right)\cdot\left(36\cdot111\cdot3-111\cdot108\right)\)
\(=\left(2+4+6+...+100\right)\cdot111\cdot\left(36\cdot3-108\right)\)
\(=\left(2+4+6+...+100\right)\cdot111\cdot\left(108-108\right)\)
\(=\left(2+4+6+...+100\right)\cdot111\cdot0=0\)
a)
120.15+12.470+12.38.10
=120.15+120.47+120.38=120(15+47+38)=120.100=12000
b)
13.58.4+32.26.2+52.10
=52.58+52.26+52.10=52.(58+26+10)=52.100=5200
c)
3,2.990+32=32.99+32=32.(99+1)=32.100=3200
d)
45.(13+78)+9.(87+22).5
=45.91+45.109=45.(91+109)=45.200=9000
e)
(24+72+36+60):12=12.(2+6+3+5):12=16
f)(2+4+6+...+100)(36.333−108.111)
=(2+4+6+...+100)(36.3.111−36.3.111)=(2+4+6+...+100).0=0
Bài 1 :
a) 37581 - 9999 = 37581 - 10000 - 1 = 27581 - 1 = 27580
k cho mình nha bạn !
a)37581-9999=37581-(9999+1-1)=37581-(10000+1)=37581-10000-1=27581+1=27582
Đáp án:
= 335
Hok tốt
45 + 36 + 78 + 54 + 64 + 22 + 36
= ( 36 + 54 ) + ( 78 + 22 ) + ( 64 + 36 ) + 45
= 90 + 100 + 100 + 45
= 190 + 45
= 235
~ Hok T ~