Tính bằng hai cách:
a) 216 : (8 × 9)
b) 476: (17 × 4)
Tính bằng hai cách
a) 216 : ( 8 x 9 ) = bao nhiêu?
b) 476 : ( 17 x 4 )= bao nhiêu?
a)C1: 216:72=3
C2: 216:8:9=27:9=3
b)C1: 476:68=7
C2:476:17:4=28:4=7
a) 216 : ( 8 x 9 )
cách 1 :
=216 : 72
=3
cách 2 :
=216 : 8 : 9
=27 : 9
=3
b) 476 : ( 17 x 4 )
cách 1:
= 476 : 68
=7
cách 2:
=476 : 17 : 4
= 28 : 4
= 7
Tính bằng hai cách:
a) 93 x 8 + 93 x 2
b) 36 x 9 + 64 x 9
c) 57 x 8 – 57 x 7
\(a,C1=744+186\\ =930\\ C2=93\times\left(8+2\right)\\ =93\times10=930\\ b,C1:=324+576\\ =900\\ C2=9\times\left(36+64\right)\\ =9\times100\\ =900\\ c,C1=456-399\\ =57\\ C2=57\times\left(8-7\right)\\ =57\)
\(a)\)\(93\times8+93\times2\)
\(=98\times\left(8+2\right)\)
\(=98\times10\)
\(=980\)
\(b)36\times9+64\times9\)
\(=9\times\left(36+64\right)\)
\(=9\times100\)
\(=900\)
\(c)57\times8+57\times7\)
\(=57\times\left(8-7\right)\)
\(=57\times1\)
\(=57\)
Tính bằng 2 cách :135-15-28=
216:(8x9)=
476:17:4
135 - 15 - 28 =?
Cách 1 : 135 - 15 - 28 = 120 - 28 = 92
Cách 2 : 135 - 15 - 28 = 135 - ( 15 + 28 ) = 135 - 43 = 92
216 : ( 8 x 9 ) = ?
Cách 1 : 216 : ( 8 x 9 ) = 216 : 72 = 3
Cách 2 : 216 : ( 8 x 9 ) = 216 : 8 : 9 = 27 : 9 = 3
476 : 17 : 4 = ?
Cách 1 : 476 : 17 : 4 = 28 : 4 = 7
Cách 2 : 476 : 17 : 4 = 476 : ( 17 x 4 ) = 476 : 68 = 7
Tính bằng hai cahs
216:(8x9) 476:(17x4)
C1 :
216 : ( 8 x 9 )
= 216 : 72
= 3
C2 :
216 : ( 8 x 9 )
= 216 : 8 : 9
= 27 : 9
= 3
C1 :
476 : ( 17 x 4 )
= 476 : 68
= 7
C2 :
476 : ( 17 x 4 )
= 476 : 17 :4
= 28 : 4
= 7
A C1 216:(8*9)
=216:73
=3
C2 216:8:9
=27:9
=3
B. C1 . 476:(17*4
=476:68
=7
C2 . 476:17:4
=28:4
=7
Hok tốt
Tính bằng hai cách:
a) \(\dfrac{7}{11}:\dfrac{3}{5}+\dfrac{4}{11}:\dfrac{3}{5}\); b) \(\left(6,24+1,26\right):0,75\).
a) \(\dfrac{3}{5}:\left(\dfrac{7}{11}+\dfrac{4}{11}\right)=\dfrac{3}{5}.1=\dfrac{3}{5}\)
c2: \(\dfrac{7}{11}:\dfrac{3}{5}+\dfrac{4}{11}:\dfrac{3}{5}=\dfrac{7}{11}.\dfrac{5}{3}+\dfrac{4}{11}.\dfrac{5}{3}=\dfrac{3}{5}\)
a)
C1: \(\dfrac{7}{11}:\dfrac{3}{5}+\dfrac{4}{11}:\dfrac{3}{5}=\left(\dfrac{7}{11}+\dfrac{4}{11}\right):\dfrac{3}{5}=1:\dfrac{3}{5}=\dfrac{5}{3}\)
Tính bằng hai cách:
a) (1/3 - 1/5) x 1/4
b) 2/5 x 3/7 + 2/5 x 4/7
Giúp mình với mình đang cần gấp
a)
(1/3-1/5)x1/4 = 1/3x1/4-1/5x1/4=1/12-1/20=1/30
(1/3-1/5)x1/4 = 2/15x1/4=1/30
b)
2/5 x 3/7 + 2/5 x 4/7= 6/35 + 8/35 = 14/35 = 2/5
2/5 x 3/7 + 2/5 x 4/7= (3/7+4/7) x 2/5 = 1 x 2/5 = 2/5
Tính bằng hai cách:
a) (1/3 - 1/5) x 1/4
b) 2/5 x 3/7 + 2/5 x 4/7
Giúp mình với mình đang cần gấp
a: C1: (1/3-1/5)*1/4
=2/15*1/4=2/60=1/30
C2: (1/3-1/5)*1/4
=1/3*1/4-1/5*1/4
=1/12-1/20=1/30
b: C1: 2/5*3/7+2/5*4/7
=6/35+8/35=14/35=2/5
C2: 2/5*3/7+2/5*4/7
=2/5(3/7+4/7)
=2/5*1=2/5