a. (286 : 11 +7 x 2) x 3 - 13

= (26 + 14) x 3 - 13

= 40 x 3 - 13

= 120 - 13

= 107

b. 35 x 34 + 65 x 75 + 35 x 38 + 65 x 45 

= (35 x 34) + (65 x 75) + (35 x 38) + (65 x 45)

= 1190 + 4875 + 1330 + 2925

= (1190 + 1330) + (4875 + 2925)

= 2520 + 7800

= 10 320

a, 35.(34+86) +65.(75+45)= 35. 120 +65.120= 120.(35+65)=120.100=12000

a, 35x34+35x86+65x75+65x45

=35x(34+86)+65x(75+45)

=35x120+65x120

=120x(35+65)

=120x100

=12000

b,3x25x8+4x6x37+2x8x12

=24x25+24x37+24x8

=24x(25+37+8)

=24x70

=1680

35 x 34 + 35 x 86 + 65 x 75 + 65 x 45

= 35 x ( 34 + 86 ) + 65 x ( 65 + 45 )

= 35    x    120   +    65    x     120

 =      120 x ( 35 + 65 )

=           120 x 100 = 12000

a,35x34+35x86+65x75+65x45

=35x(34+86)+65x(75+45)

=35x120+65x120

=120x(35+65)

=120x100

=12000

b,3x25x8+4x37x6+2x38x12

=(3x8)x25+(4x6)x37+(2x12)x38

=24x25+24x37+24x38

=24x(25+37+38)

=24x(62+38)

=24x100

=2400

c,12x53+53x172-53x84

=53x(12+172-84)

=53x(184-84)

=53x100

=5300

a.35x(34+86)+65x(75+45)=35x120+65x120=120x(35+65)=120x100=12000

b.3x25x8+4x37x6x2x38x12=24x25+24x37+24x38=24x(25+37+38)=24x100=2400

c.53x(12+172-84)=53x100=5300

a)  35x34+35x86+65x75+65x45

=35.(34+86)+65.(75+45)

=35.120+65.120

=120.(35+65)

=120.100

=12 000

b)   3x25x8+4x37x6+2x38x12

=75.8+148.6+76.12

= 600+888   +912

=2400

c)12x53+53x172-53x84

=53.(12+172-84)

=53.100

=5300

Học Tốt ! #Moon#

1) a) \(35.34+35.58+65.75+65.45\)

\(=35\left(34+58\right)+65\left(75+45\right)\)

\(=35.92+65.120\)

\(=3220+7800=11020\)

b) \(39,8+60,2+21,8-100\)

\(=\left(39,8+60,2\right)-100+21,8\)

\(=100-100+21,8=0+21,8=21,8\)

c) \(36.28+64.49+36.82+41.64\)

\(=36\left(28+82\right)+64\left(49+41\right)\)

\(=36.110+64.90\)

\(=3960+5760\)\(=9720\)

35x34+35x38+65x45+65x27

=35x(34+38)+65x(45+27)

=35x72+65x72

=72x(35+65)

=72x100

=7200

35 x 34 + 35 x 38 + 65 x 45 + 65 x 27

= 35 x ( 34 + 38 ) + 65 x ( 45 + 27 )

= 35 x 72 + 65 x 72

= ( 35 + 65 ) x 72

= 100 x 72

= 7200

35x34+35x38+65x45+56x27

=35x(34+38)+65x(45+27)

=35x72+65x72

=72x(35+65)

=72x100

=7200

Chúc bạn học giỏi nha!!!

K cho mik với nhé Thu Thuỷ Nguyễn

35 x 34 + 35 x 38 + 65 x 45 + 65 x 27

= 35 x (34 + 38) + 65 x ( 45 + 65)

= 35 x 72 + 65 x 110

= 2510 + 7150

= 9660

d) 35x34 +35x38 + 65x75 + 65x45

= 35 x ( 34 + 38 ) + 65 x ( 75 + 45 )

= 35 x 72 + 65 x 120

= 2520 + 7800

= 10 320

d) 35x34 +35x38 + 65x75 + 65x45

= 35 ( 34 + 38 ) + 65 ( 75 + 45)

= 35 * 72 + 65 * 120

= 2520 + 7800

= 10320

tính hợp lí giúp mk nha

a) 12 x 53 + 53 x 172 - 53 x 84

= 53 x ( 12 + 172 - 84 )

= 53 x 100

= 5300

b) 35 x 34 + 35 x 95 + 65 x 75 + 65 x 54

= ( 35 x 34 + 35 x 95 ) + ( 65 x 75 + 65 x 54 )

= 35 x ( 34 + 95 ) + 65 x ( 75 + 54 )

= 35 x 129 + 65 x 129

= ( 35 + 65 ) x 129

= 100 x 129

= 12900

c) 86 x 7676 - 8686 x 76

= 86 x 76 x 101 - 86 x 101 x 76

= 0

d) 6969 x 45 - 4545 x 59

= 69 x 101 x 45 - 45 x 101 x 59

= 45 x 101 x ( 69 - 59 )

= 4545 x 10

= 45450

e) 351 x 67 + 351 x 16 + 649 x 83

= 351 x ( 67 + 16 ) + 649 x 83

= 351 x 83 + 649 x 83

= ( 351 + 649 ) x 83

= 1000 x 83

= 83000 

f) 42 x 53 + 47 x 156 - 47 x 114

= 42 x 53 + 47 x ( 156 - 114 )

= 42 x 53 + 47 x 42

= 42 x ( 53 + 47 )

= 42 x 100

= 4200

g) 3851 : 500 + 1149 : 500

= ( 3851 + 1149 ) : 500 

= 5000 : 500

= 10

h) 4783 : 300 - 1783 : 300

= ( 4783 - 1783 ) : 300

= 3000 : 300

= 10 

câu cuối hơi sai nên bạn gửi lại câu đó nha