Tinh bang hai cach
5/24×5/12×24
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4+8+12+16+20+24+28
= (16+24)+(28+12)+20+4+8
= 40+40+20+12
= 112
(16432+82528):4
=98960:4
=24740
(16432+82528):4
=16432:4+82528:4
=4108+20632
=24740
120:(8*5)
=120:40
=3
120:(8*5)
=120:8:5
=15:5
=3
(18*24):6
=432:6
=72
(18*24):6
=18*24:6
=432:6
=72
Cách 1:
\(\frac{5}{12}:\frac{2}{5}+\frac{7}{12}:\frac{2}{5}-\frac{1}{3}:\frac{2}{5}\)
\(=\frac{5}{12}\times\frac{5}{2}+\frac{7}{12}\times\frac{5}{2}-\frac{1}{3}\times\frac{5}{2}\)
\(=\frac{25}{24}+\frac{35}{24}-\frac{5}{6}\)
\(=\frac{25}{24}+\frac{35}{24}-\frac{20}{24}\)
\(=\frac{5}{3}\)
Cách 2.
\(\frac{5}{12}:\frac{2}{5}+\frac{7}{12}:\frac{2}{5}-\frac{1}{3}:\frac{2}{5}\)
\(=\frac{5}{12}\times\frac{5}{2}+\frac{7}{12}\times\frac{5}{2}-\frac{1}{3}\times\frac{5}{2}\)
\(=\left(\frac{5}{12}+\frac{7}{12}-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\left(1-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\left(\frac{3}{3}-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\frac{2}{3}\times\frac{5}{2}\)
\(=\frac{5}{3}\)
Linz
Cách 1 : (32 x 24) : 4 = 768 : 4 = 192
Cách 2 : (32 x 24) : 4 = 32 x 24 : 4 = 768 : 4 = 192
Cách 3 : (32 x 24) : 4 = 32 x 24 : 4 = 32 : (24 : 4) = 32 x 6 = 192
Cách 1 ;;
( 32 * 24 ) : 4
= 768 : 4
= 192
Cách 2 :
( 32 * 24 ) : 4
= 32 * ( 24 : 4 )
= 32 x 6
= 192
Cách 3 :
( 32 * 24 ) : 4
= ( 32 : 4 ) * 24
= 8 * 24
= 192
**** mk nha
a (25 + 45) : 5 = 70 : 5 = 14
(45 + 25) : 5 = 45 : 5 + 25 : 5 = 9 + 5 = 14
b 24 : 6 + 36 : 6 = 4 + 6 = 10
24 : 6 + 36 : 6 = (24 + 36) : 6 = 60 : 6 = 10
a) 365.12.4+365.52=365.(12.4)+365.52=365.48+365.52=365.(48+52)=365.100=36 500
b)48.18+24.64=24.2.18+24.64=24.(2.18)+24.64=24.36+24.64=24.(36+64)=24.100=2 400
a)365x12x4+365x2
=365x48+365x2
=365(48+20
=365x50
=18250
b)48x18+24x64
=48x18+24x2x32
=48x18+48x32
=48x(18+32)
=48x50
=2400
46:24+8:24
= ( 46+8):24
= 54:24
=2 ( dư 6)
705:45-336:45
= ( 705-336):45
= 369:45
= 8,8