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a: =1250:25=50
b: =234(45+55)+234=23400+234=23634
c: =1000x1000=1000000
a) (48 x 55) : 8
= (48:8)x55
= 6x55
= 330
b) (164 x 42) : 7
= 164x(42:7)
= 164x6
= 984
c) (135 x 25) : 5
= 135x(25:5)
= 135x5
= 675
d) (147 x 12) : 6
= 147x(12:6)
= 147x2
= 294
(Nếu đúng thì cho mk tick nhé)
a) 672 x 25 + 672 x 55 + 627 x 9 + 627 x 10 + 672
= 672 x (25 + 55 + 9 + 10 + 1)
= 672 x 100
= 67200
672 x 25 + 672 x 55 + 672 x 9 + 672 x 10 + 672
= 672 x 25 + 672 x 55 + 672 x 9 + 672 x 10 + 672 x 1
= 672 x (25 + 55 + 9 + 10 + 1)
= 672 x 100
= 67200.
\(\dfrac{7}{5}\times\dfrac{11}{24}\times\dfrac{5}{7}\times\dfrac{24}{55}\\ =\left(\dfrac{7}{5}\times\dfrac{5}{7}\right)\times\left(\dfrac{11}{24}\times\dfrac{24}{55}\right)\\ =1\times\dfrac{1}{5}\\ =\dfrac{1}{5}\)
a, ( 75 x 56 ) : 15 1175 : 25 + 1325: 25 + 466 x 25
= (75: 15) x 56 = ( 1175 + 1325) : 25 + 466 x 25
= 3 x 56 = 2500 : 25 + 466 x25
= 168 = 100 + 466 x 25
b, ( 80 x125 x10) : 25 = 25 x 4 + 466 x 25
= ( 80 x 10) x ( 125:25) = 25 x ( 4 + 466)
= 800 x 5 = 25 x 470
= 4 000 = 11750
d, ( 750 x 360 x 55) : ( 15 x 12 x 110)
= ( 75 x 360 x 550 ) : ( 15 x 12 x 110)
= (75 : 15 ) x ( 360 : 12) x ( 550 : 110)
= 5 x 30 x 5
= 25 x 30
= 750
a) (75 x 56) : 15
= 4200 : 15
= 280
b) (80 x 125 x 10) : 25
= 100 000 : 25
= 4000
c) 1175 : 25 + 1325 : 25 + 466 x 25
= (1175 : 25) + (1325 : 25) + (466 x 25)
= 47 + 53 + 11 650
= 11 750
d) (750 x 360 x 55) : (15 x 12 x 110)
= 14 850 000 : 19 800
= 750
24 x 55 + 12 x 88 + 24
= ( 24 x 55 ) + ( 12 x 88 ) + 24
= 1320 + 1056 + 24
= 2376 + 24
= 2400
_HT_
\(24\cdot55+12\cdot88+24\)
\(\Leftrightarrow\left(24\cdot55\right)+\left(24\cdot88:2\right)+24\)
\(\Rightarrow\left(24+55\right)+\left(24\cdot44\right)+24\)
\(\Leftrightarrow24\left(55+44+1\right)\)
\(\Leftrightarrow24\cdot100\)
\(\Leftrightarrow2400\)
`a: =(7/3-4/3)+11/5=16/5`
`b: =(18/13-5/13)+55/46=1+55/46=101/46`
`c: =27/25-4/9-2/25+5/9=(27/25-2/25)+(5/9-4/9)=1+1/9=10/9`
a, =12 x ( 45 + 55 )
= 12 x 100
= 1200
b, = 25 x 4 x 280
= 100 x 280
= 28000
c, = 268 x ( 192 -92)
= 268 x 100
= 26800
Câu 2: Tính bằng cách thuận tiện nhất:
\(a)\)\(12\times45+12\times55\)
\(=\)\(12\times\left(45+55\right)\)
\(=\)\(12\times100\)
\(=\)\(1200\)
\(b)\)\(25\times280\times4\)
\(=\)\(25\times4\times280\)
\(=\)\(100\times280\)
\(=\)\(28000\)
\(c)\)\(268\times192-92\times268\)
\(=\)\(268\times\left(192-92\right)\)
\(=\)\(268\times100\)
\(=\)\(26800\)
=55(25-20+4+1)
=55.10
=550
=55(25-20+4+1)
=55