Tính bằng hai cách:
a)18x(8-3)
b)180:(2x10)
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 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
tính bằng hai cách:a/8,3-1,4-3,6=?
b/18,64-(6,24+10,5)=?
ai làm đúng mình tick ha :>
a,
C1: 8,3 - 1,4 - 3,6 = 6,9 - 3,6= 3,3
C2: 8,3 - 1,4 - 3,6= 8,3 - (1,4 + 3,6)= 8,3 - 5= 3,3
b,
C1: 18,64 - ( 6,24 + 10,5)= 18,64 - 16,74= 1,9
C2 : 18,64 - ( 6,24 + 10,5) = 18,64 - 6,24 - 10,5 = 12,4 - 10,5 = 1,9
a,
C1: 8,3-1,4-3,6=6,9-3,6=3,3
C2: 8,3-1,4-3,6=8,3-(1,4+3,6)=8,3-5=3,3
b,
C1:18,64-(6,24+10,5)=18,64-16,74=1,9
C2: 18,64-(6,24+10,5)=18,64-6,24-10,5=1,9
a,
C1: 8,3 - 1,4 - 3,6 = 6,9 - 3,6= 3,3
C2: 8,3 - 1,4 - 3,6= 8,3 - (1,4 + 3,6)= 8,3 - 5= 3,3
b,
C1: 18,64 - ( 6,24 + 10,5)= 18,64 - 16,74= 1,9
C2 : 18,64 - ( 6,24 + 10,5) = 18,64 - 6,24 - 10,5 = 12,4 - 10,5 = 1,9
a=[(7^2x10^3+6^2x10^3+2x10^4-5000):5^3]:8
a = (7^2.2^3+6^2.2^3+2.5.2^4-40) : 8
= (7^2.8+6^2.8+2^2.5.8-5.8) : 8
= 7^2+6^2+2^2.5-5 = 49+36+20-5 = 100
k mk nha
Tính bằng 2 cách:
a. 360 : (3 x 5) b. 1440 : (2 x 5)
C1:\(a,360:\left(3.5\right)\)
\(=360:15\)
\(=24\)
C2:\(\left(360:3\right):5\)
\(=120:5\)
\(=24\)
C1:\(b,1440:\left(2.5\right)\)
\(=1440:10\)
\(=144\)
C2:\(\left(1440:2\right):5\)
\(=720:5\)
\(=144\)
\(a,C1:360:\left(3\times5\right)=360:15=24\\ C2:360:\left(3\times5\right)=\left(360:3\right):5=120:5=24\\ b,C1:1440:\left(2\times5\right)=1440:10=144\\ C2;1440:\left(2\times5\right)=\left(1440:2\right):5=720:5=144\)
C1:a,360:(3.5)a,360:(3.5)
=360:15=360:15
=24=24
C2:(360:3):5(360:3):5
=120:5=120:5
=24=24
C1:b,1440:(2.5)b,1440:(2.5)
=1440:10
Tính bằng hai cách:
a,(75+25):5
b,(84-24):4
c,(123+456):3
d,(936-306):6
\(a,C1:\left(75+25\right):5=100:5=20\\ C2:\left(75+25\right):5=75:5+25:5=15+5=20\)
\(b,C1:\left(84-24\right):4=60:4=15\\ C2\left(84-24\right):4=84:4-24:4=21-6=15\)
\(c,C1:\left(123+456\right):3=579:3=193\\ C2:\left(123+456\right):3=123:3+456:3=41+152=193\)
\(d,C1:\left(936-306\right):6=630:6=105\\C2:\left(936-306\right) :6=936:6-306:6=156-51=105\)
a,(75 + 25) : 5
C1: 100 : 5 = 20
C2: 75 : 5 + 25 : 5 = 15 + 5 = 20
b,(84 - 24) : 4
C1: 60 : 4 = 15
C2: 84 : 4 - 24 : 4 = 21 - 6 = 15
c,(123 + 456) : 3
C1: 579 : 3 = 193
C2: 123 : 3 + 456 : 3 = 41 + 152 = 193
d,(936 - 306) : 6
C1: 630 : 6 = 105
C2: 936 : 6 - 306 : 6 = 156 - 51 = 105
Tính giá trị (làm tròn đến hàng đơn vị) của các biểu thức sau bằng hai cách:
a) ;
b) ;
c)