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2008 x 99 + 2008
= 2008 x 99
= 198792
624 x 725 + 725 x 376
= 624 x 376
= 234624
2009 x 101 - 2009
= 2009 x 101
= 202909
1996 x 1001 - 1896
= 1997996 - 1896
= 1996100
Hk otots,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
k nhé
2008x99+2008 624x725+725x376 2009x101-2009 1996x1001-1996
=2008x99+2008x1 =(624+376)x725 =2009x101-2009x1 =1996x1001-1996x1
=2008x(99+1) =1000x725 =2009x(101-1) =1996x(1001-1)
=2008x100 =725000 =2009x100 =1996x1000
=200800 =200900 =1996000
=3/4.0,25+3/4.1,25-3/4.0,5
=3/4.(0,25+1,25-0,5)
=3/4.10
=15/2
\(a.5,2\times9+5,2=5,2\times\left(9+1\right)=5,2\times10=52\)
\(b.12,3\times101-12,3=12,3\times\left(101-1\right)=12,3\times100=1230\)
\(c.1,25\times0,25\times2,3\times4\times8\times11=\left(1,25\times8\right)\times\left(0,25\times4\right)\times2,3\times11=10\times1\times25,3=253\)
a , 5,2 . 9 + 5,2
= 5,2 . 9 + 5,2 . 1
= 5,2 . ( 9 + 1 )
= 5,2 . 10
= 52 .
b , 12,3 . 101 - 12,3
= 12,3 . 101 - 12,3 . 1
= 12,3 . ( 101 - 1 )
= 12,3 . 100
= 1230 .
c , 1,25 . 0,25 . 2,3 . 4 . 8 . 11
= ( 1,25 . 8 ) . ( 0,25 . 4 ) . ( 2,3 . 11 )
= 10 . 1 . 25,3
= 10 . 25,3
= 253 .
Hok tốt :))
2008 \(\times\) 0,25 \(\times\) 0,125 \(\times\) 128
= 2008 \(\times\) 0,25 \(\times\) 0,125 \(\times\)4 \(\times\) 8 \(\times\) 4
= 2008 \(\times\) ( 0,25 \(\times\) 4) \(\times\) ( 0,125 \(\times\)8) \(\times\) 4
= 2008 \(\times\) 1 \(\times\)1 \(\times\) 4
= 2008 \(\times\) 4
= 8032
2008 ×× 0,25 ×× 0,125 ×× 128
= 2008 ×× 0,25 ×× 0,125 ××4 ×× 8 ×× 4
= 2008 ×× ( 0,25 ×× 4) ×× ( 0,125 ××8) ×× 4
= 2008 ×× 1 ××1 ×× 4
= 2008 ×× 4
= 8032
1
a.2008+2009+2010+2011+2012
=(2008+2012)+(2009+2011)+2010
=2020+2020+2010
=4040+2010
=6050
b.17,75+4,64+7,63+2,25
=(17,75+2,25)+(4,64+7,63)
=20+12,27
=32,27
c.7/9+2/3+2/9+1
=(7/9+2/9)+1+2/3
=1+1+2/3
=2+2/3
=5/3
2.
a.12,3x2,5+2,5x27,7
=2,5x(12,3+27,7)
=2,5x40
=100
b.42x3+42x12-42x5
=42x(3+12-5)
=42x10
=420
c.13,8-4,24-5,76+2,2
=(13,8-2,2)-(5,76+4,24)
=11,4-10
=1,4
3.
a.Xx3,1+Xx6,9=30,4
X x (3,1+6,9)=30,4
=X x10=30,4
X=30,4:10
X=3,04
b.X:1,5+0,45=7,65
X:1,5=7,65-0,45
X:1,5=7,2
X=7,2x1,5
X=10,8
1 tinh bang cach thuan tien nhat
a ( 2008 +2012 ) + (2009+2011) + 2010
= 2020+ 2020+2010
=2050
b (17,75 +2,25 ) + 7,63+2,25
= 21+7,63+2,25
=30,88
7/9+2/3+2/9 +1
= (2/9 +7/9 ) + 2/3+ 1
= 1+ 2/3 + 1
= 2 và 2/3
2
= 2,5 x ( 12,3 + 27,7 )
= 2,5 x 40
=16
42 x ( 3+12 -5 )
= 42 x 10
= 420
( 13,8 +2,2 ) - 4,24-5,76
= 16 - 4,24-5,76
= 5
3 tim x
X * 3,1 + x * 6,9 = 30,4
x = 30,4 : ( 3,1+6,9 )
x= 30,4 ; 10
x= 3,04
b x: 1,5 + 0,,45 = 7,65
x= 7,65 x ( 1,5 + 1.45 )
x= 7.65 x 2,95
x=22,5675
minh nhanh nhat nha
\(17\cdot\frac{3}{4}-17\cdot0,25+17\cdot\frac{1}{2}\)
\(=17\cdot0,75-17\cdot0,25+17\cdot0,5\)
\(=17\cdot\left(0,75-0,25+0,5\right)\)
\(=17\cdot1\)
\(=17\)
\(17\times\frac{3}{4}-17\times0,25+17\times\frac{1}{2}\)\(=17\times\frac{3}{4}-17\times\frac{1}{4}+17\times\frac{1}{2}\)\(=17\times\left(\frac{3}{4}-\frac{1}{4}+\frac{1}{2}\right)\)
\(=17\times\left(1\right)\)\(=17\)
Lời giải:
$=27\times 2+12,44\times 4+17,56\times 4+23\times 2$
$=2\times (27+23)+4\times (12,44+17,56)$
$=2\times 50+4\times 30$
$=100+120=220$
giữa 2008 : 0.25 và 2009 : 4 là dấu gì hả bạn
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