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10 x 45 - 25 x 10
= 10 x ( 45 - 25 )
= 10 x 20
= 200
100 x 2 + 100 x 3
= 100 x ( 2 + 3 )
= 100 x 5
= 500
10 x 45 - 25 x 10
= 10 x [45 - 25]
= 10 x 20
= 200
100 x 2 + 100 x 3
= 100 x [2 + 3]
= 100 x 5
= 500
\(25.86+25.14\)
\(=25.\left(86+14\right)\)
\(=25.100\)
\(=2500\)
\(Happy\)\(New\)\(Year\)
tk ủng hộ nha
Năn nỉ
\(0,12\times400=0,12\times4\times100=\left(0,12\times100\right)\times4=12\times4=48\)
\(4,7\times5,5-4,7\times4,5=4,7\times\left(5,5-4,5\right)=4,7\times1=4,7\)
0 , 12 x 400
= ( 0 , 12 x 100 ) x 4
= 12 x 4
= 48
4 , 7 x 5 , 5 - 4 , 7 x 4 , 5
= 4 , 7 x ( 5 , 5 - 4 , 5 )
= 4 , 7 x 1
= 4 , 7
Chúc bạn học tốt !
a. = 19 x ( 5 x 2 ) b. 97 x 2 x 3 x 5 c. = ( 4 x 25 ) x 3 d. = 7 x 3 x ( 4 x 25 )
= 19 x 10 = 97 x 3 x ( 2 x 5 ) = 100 x 3 = 21 x 100
= 190 = 291 x 10 = 300 = 2100
= 2910
= 15 x (5 x 2) = ( 16 x 5 ) x 27 = ( 25 x 4 ) x 6 = ( 25 x 4 ) 7 x 5
= 15 x 10 = 80 x 27 = 100 x 6 = 100 x 35
= 150 = 2160 = 600 = 3500
64 x 4 + 18 x 4+ 9 x 8
= 64 x4 + 18 x4 + 9 x 2 x 4
= 64 x 4+ 18 x 4+ 18 x 4
= 4x(64+18+18)
= 4 x 100
= 400
a) 22,56 - 7,59 - 8,41
= 22,56 - ( 7,59 + 8,41 )
= 22,56 - 16
= 6,56
b) 53,48 - 19,84 - 22,16
= 53,48 - ( 19,84 + 22,16 )
= 53,48 - 42
= 11,48
c) 14,23 + 7,06 - 1,23
= ( 14,23 - 1,23 ) + 7,06
= 13 + 7,06
= 20,06
d) 20,06 - 12,37 - 7,63
= 20,06 - ( 12,37 + 7,63 )
= 20,06 - 20
= 0,06
Học tốt nha ^-^
a)22,56 – 7,59 – 8,41
=22,56-(7,59+8,41)
=22,56-16
=6,56
b) 53,48 – 19,84 – 22,16
=53,48-(19,84+22,16)
=53,48-42
=11.48
c) 14,23 + 7,06 – 1,23
=(14,23-1,23)+7,06
=13+7,06
=20.06
d)20,06 – 12,37 – 7,63
=20,06-(12.37-7,63)
=20,06-20
=0,06
a, \(22,56-7,59-8,41\\ =22,56-\left(7,59+8,41\right)\\ =22,56-16=6,56\)
b, \(53,48-19,84-22,16\\ =53,48-\left(19,84+22,16\right)\\ =53,48-42=11,48\)
c, \(14,23+7,06-1,23\\ =\left(14,23-1,23\right)+7,06\\ =15+7,06=22,06\)
d, \(20,06-12,37-7,63\\ =20,06-\left(12,37+7,63\right)\\ =20,06-20=0,06\)
C1: \(\left(\frac{3}{5}+\frac{4}{9}\right)\cdot\frac{3}{8}=\frac{47}{45}\cdot\frac{3}{8}=\frac{141}{360}=\frac{47}{120}\)
C2: \(\left(\frac{3}{5}+\frac{4}{9}\right)\cdot\frac{3}{8}=\frac{3}{5}\cdot\frac{3}{8}+\frac{4}{9}\cdot\frac{3}{8}=\frac{9}{40}+\frac{12}{72}=\frac{47}{120}\)
100 + 100 : 4 – 50 : 2
= 100 + 25 – 25
= 125 – 25
= 100