43 . 54 + 57 . 54 - 23 . 39 - 61. 23
Tính nhanh
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40 = ???
12 . 25 + 29 . 25 + 59 . 25 = ???
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57 = ???
12 . 53 + 53 . 172 - 53 = ???
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45 = ???
39 . 8 + 70 . 3 + 31 . 8 = ???
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40
= 2. 53 . 9 . 3 + 2. 3 .9 .87 - 3 .2 .9 .40
= 54.53+54.87-54.40
=54(53+87-40)
=54. 100=5400
12 . 25 + 29 . 25 + 59 . 25
= 25 . ( 12+29+59)
=25 . 90
=2250
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
= 43.(37+93)+57(61+69)
=43.130+57.130
=130.(43+57)
=130.100
=13 000
12 . 53 + 53 . 172 - 53
=53(12+172-1)
=53.184
=9752
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45
=35(54+58)+65(75+45)
=35.112+65.120
=3920+7800
=11720
39 . 8 + 70 . 3 + 31 . 8
=8(39+31)+70.3
=8.70+70.3
=70.(8+3)
=70.11
=770
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40
= ( 2 . 27 ) . 53 + ( 6 . 9 ) . 87 - ( 3 . 18 ) . 40
= 54 . 53 + 54 . 87 - 54 . 40
= 54(53+87-40)
= 5400
12 . 25 + 29 . 25 + 59 . 25
= 25( 12 + 29 + 59 )
= 2500
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
= 43( 37 + 93 ) + 57(61 + 69 )
= 5590 + 7410
= 13000
12 . 53 + 53 . 172 - 53
= 53( 12 + 172 ) - 53
= 9752 - 53
= 9699
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45
= 35( 54 + 58 ) + 65( 75 + 45 )
= 3920 + 7800
= 11720
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
Tính nhanh bằng cách hợp lí
a) 54 + ( -37+ 10 -54 + 67)
b) ( 326-43)+( 174-57)
a) 54 + ( -37+ 10 -54 + 67)
=54-37+10-54+67
=(54-54)+(-37+67)+10
=30-10
=20
b) ( 326-43)+( 174-57)
=326-43+174-57
=(326+174)+(-43-57)
=500-100
=400
hok tốt
\(\text{a) 54 + ( -37+ 10 -54 + 67)}\)
\(=54+\left(-37\right)+10+\left(-54\right)+67)\)
\(=\left[54+-\left(54\right)\right]+\left[67+\left(-37\right)\right]+10\)
\(=0+40+10=50\)
\(\text{b) ( 326-43)+( 174-57)}\)
\(\text{=326-43+174-57}\)
\(=\left(326+174\right)-\left(43+57\right)\)
\(=500-100=400\)
a) 54 + ( -37+ 10 -54 + 67)
=54+ (-37)+10-54+67
=54+(-54)+(10+67)+(-37)
=0+77+(-37)
=40
b) ( 326-43)+( 174-57)
=326-43+174-57
=(326+174)+(-43-57)
=500-100
=400
12+(54+43)+23-54+65:5=?
ê k mìn đik
mìn chỉ cho
52+48+54+46+57+44+43
52 + 48 + 54 + 46 + 57 + 44 + 43
= ( 52 + 48) + ( 54 + 46) + ( 57 + 43) + 44
= 100 + 100 + 100 + 44
= 100 \(\times\) 1 + 100 \(\times\) 1 + 100 \(\times\) 1 + 44
= 100 \(\times\) ( 1 + 1 + 1) + 44
= 344
TL:
= ( 57 + 43 ) + ( 54 + 56 )
= 100 + 110 = 210
_HT_
43x37+93x43+57x61+69x57=13000
1300
ai bấm sai thì cứ bấm
nhưng mình đúng thì vẫn là thật
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