a)8x427x3+6x573x4=24x427+24x573=24x(427+573)=24x1000=24000

b)86x27-43x54=43x2x27-43x2x27=0

c)(145x99+145)-(143x101-143)=145x(99+1)-[143x(101-1)]=145x100-143x100=14500-14300=200

d)10000-(47x72+47x2)=10000-[47x(72+2)]=10000-(47x74)=10000-3478=6522

                                               ~~~~~~HT~~~~~~

Bài làm

10000 - 47 x7 - 47 x 28

=47x(10000-28)-7

=47x9942-7

=467274-7

=467267

# Chúc banj học tốt #

      \(10000-47\text{ x }7-47\text{ x }28\)

\(=10000-47\text{ x }\left(7+28\right)\)

\(=10000-47\text{ x }35\)

\(=10000-1645\)

\(=8355\)

Bài làm

Bài 1 : Tính nhanh 

a) 10000 - 47x 7 -47 x 28

= 47x(10000-28)

=47x9972

=468684

b) 54x 47 - 53x 47 - 47

=47x(54-53)-47

=47x1-47

=47-47

=0

c)175 x 1274 - 175 x 273 - 175

=175x(1274-273)-175

=175x1001-175

=175175-175

=175000

# Chúc bạn học tốt #

kho nhi

10000 - 47 × 72 - 47 × 28

= 100 × 100 - 47 × (72 + 28)

= 100 × 100 - 47 × 100

= 100 × (100 - 47)

= 100 × 53 = 5300

sigma boy

1000 - 47 . 72 - 47 .28

= 47 . ( 1000 - 72 -28 )

= 47 .0

=0

3457 - 27 . 48 - 48 .73 + 6543

=3457 - 48 . (27 + 73 ) + 6543

= 3457 - 4800 + 6543

= 5200

=561/704*(39/47+8/47)

=561/704*47/47

=561/704*1

=561/704

\(\frac{561}{704}.\frac{39}{47}+\frac{561}{704}.\frac{8}{47}\)

\(=\frac{561}{704}.\left(\frac{39}{47}+\frac{8}{47}\right)\)

\(=\frac{561}{704}.1\)

\(=\frac{51}{64}\)

=100000-(47.(75+24+1)       b)    =276.(50+36+4)

=100000-4700                              =276.90

=95300                                         =24840

\(100000-\left(47.75+47.24+47\right)\)

\(=100000-\left(47.75+47.24+47.1\right)\)

\(=100000-\left[47.\left(75+24+1\right)\right]\)

\(=100000-47.100\)

\(=100000-47000\)

\(=53000\)

\(276.50+276.36+1104\)

\(=276.50+276.36+276.4\)

\(=276.\left(50+36+4\right)\)

\(=276.90\)

\(=24840\)

40025 - 25000 : 125 : 8

=40025 - 25000 : [125 nhân 8]

=40025 - 25000 : 1000

=40025 - 25

= 40000

chúc bạn học tốt

40025-25000:125.8

=40025-25000:(125.8)

=40025-25000:1000

=40025-25

=40000

\(2b,\)\(54\times47-47\times53-20-27.\)

\(=47\times54-47\times53-47\)

\(=47\times\left(54-53-1\right)\)

\(=47\times0=0\)

\(2c,\)\(10000-47\times72-47\times28\)

\(=100\times100-47\times\left(72+28\right)\)

\(=100\times100-47\times100\)

\(=100\times\left(100-47\right)\)

\(=100\times53=5300\)

2b

54 x 47 - 47 x 53 - 20 - 27 = 47 x ( 54 - 53 ) - 20 - 27 = 47 - 20 - 27 = 47 - ( 20 + 27 ) = 47 - 47 = 0

2c

10000 - 47 x 72 - 47 x 28 = 10000 - 47 x ( 72 - 28 ) = 10000 - 47 x 44 = 10000 - 2068 = 7932