a) \(136.23+136.17-40.36\)

\(=136.\left(23+17\right)-40.36\)

\(=136.40-40.36\)

\(=40\left(136+36\right)\)

\(=40.172\)

\(=6880\)

a,29.(87-23)+64.71=29.64+64.71=64.(29+71)=64.100=6400

b,19.(27+20)+47.81=19.47+47.81=47.(19+81)=47.100=4700

c,87.(23+70)+13.93=87.93+13.93=93.(87+13)=93.100=9300

tick nha bạn

đây có phải đề cương?

l6

a.65.35

b.86.28

c.172.03

chúc hok tốt! =))

Áp dụng công thức này là được :

m.a+m.b+m.c = m(a+b+c)

a) 58.75 + 58.50 - 58.25

= 58. (75 + 50 - 25)

= 58. 100

= 5800

b) 27.39 + 27.63 + 2.27

= 27. (39 + 63 - 2)

= 27. 100

= 2700

c) 128.46 + 128.32 + 128.22

= 128.(46 + 32 + 22)

= 128. 100

= 12800

d) 12.35 + 35.182 - 35.94

= 35.(12 + 182 - 94)

= 35. 100

= 3500

e) 48.19 + 48.115 + 134.52

= 48.(19 + 115) + 134.52

= 48.134 + 134.52

= 134.(48 + 52)

= 134.100

= 13400

f) 136.23 + 136.17 - 40.36

= 136.(23 + 17) - 40.36

= 136.40 - 40.36

= 40.(136 - 36)

= 40.100

= 4000

g) 17.93 + 116.83 + 17.23

= 17.(93 + 23) + 116.83

= 17.116 + 116.83

= 116.(17 + 83)

= 116.100

= 11600

h) 19.27 + 47.81 + 19.20

= 19.(27 + 20) + 47.81

= 19.47 + 47.81

= 47.(19 + 81)

= 47.100

= 4700

i) 87.23 + 13.93 + 70.87

= 87.(23 + 70) + 13.93

= 87.93 + 13.93

= 93.(87 + 13)

= 93.100

= 9300

#NgHn

a,

58.75 + 58.50 - 58.25

= 58.(75 + 50 - 25)

= 58. (125 - 25)

= 58.100

 = 5800

b, 27.39 + 27.63 - 2.27

= 27.(39 + 63 - 2)

= 27.(102 - 2)

= 27.100

= 2700 

c, 128.46 + 128.32 + 128.22

= 128.(46 + 32 + 22)

= 128.(78 + 22)

= 128.100

= 12800

\(a,17.93+116.83+17.23\)

\(=17.\left(93+23\right)+116.83\)

\(=116.\left(17+83\right)\)

\(=116.100\)

\(=11600\)

\(b,19.27+47.81+19.20\)

\(=19.\left(27+20\right)+47.81\)

\(=47.\left(19+81\right)\)

\(=47.100\)

\(=4700\)

\(c,87.23+13.93+70.87\)

\(=87.\left(23+70\right)+13.93\)

\(=93.\left(87+13\right)\)

\(=93.100\)

\(=9300\)

\(d,78.31+78.24+78.17+22.72\)

\(=78.\left(31+24+17\right)+22.72\)

\(=72.\left(78+22\right)\)

\(=78.100\)

\(=7800\)

a) 48.19+48.115+134.52

=48.(19+115)+134.52

=48.134+134.52

=(48+52).134

=100.134

=13400

b) 27.121-87.27+73.34

=27.(121-87)+73.34

=27.34+73.34

=(27+73).34

=100.34

=3400

c)125.98-125.46-52.25

=125.(98-46)-52.25

=125.52-52.25

=(125-25).52

=100.52

=5200

d) 136.23+136.17-40.36

=136.(23+17)-40.36

=136.40-40.36

=(136-36).40

=100.40

=4000

e) 17.93+116.83+17.23

=17.(93+23)+116.83

=17.116+116.83

=(17+83).116

=100.83

=3800

ê)19.27+47.81+19.20

=19.(27+20)+47.81

=19.47+47.81

=(19+81).47

=100.47

=4700

f) 87.23+13.93+70.87

=87.(23+70)+13.93

=87.93+13.93

=(87+13).93

=100.93

=9300

câu e) sai rồi phải là 100.116=11600 mới đúng . Chúc bạn học tốt , yêu bạn nhiều

Trương Huy Tâm sai ròi

  Bằng 230.825 nha bạn!

  Chúc bạn học giỏi!

mà bn ơi đáu chấm đó là nhân hay là phẩy

48 x 19 + 48 x 115 + 134 x 52

= 48 x (19 + 115) + 134 x 52

= 48 x 134 + 134 x 52

= 134 x (48 + 52)

= 134 x 100

= 13400

27 x 121 - 87 x 27 + 73 x 34

= 27 x (121 - 87) + 73 x 34

= 27 x 34 + 73 x 34

= 34 x (27 + 73)

= 34 x 100

= 3400

125 x 98 - 125 x 46 - 52 x 23

= 125 x (98 - 46) - 52 x 23

= 125 x 52 - 52 x 23

= 52 x (125 - 23)

= 52 x 102

= 5304

136 x 23 + 136 x 17 + 40 x 36

= 136 x (23 + 17) + 40 x 36

= 136 x 40 + 40 x 36

= 40 x (136 + 36)

= 40 x 172

= 6880

17 x 93 + 116 x 83 + 17 x 23

= 17 x (93 + 23) + 116 x 83

= 17 x 116 + 116 x 23

= 116 x (17 + 23)

= 116 x 40

= 4640

19 x 27 + 47 x 81 + 19 x 20

= 19 x (27 + 20) + 47 x 81

= 19 x 47 + 47 x 81

= 47 x (19 + 81)

= 47 x 100

= 4700

87 x 23 + 13 x 93 + 70 x 87

= 87 x (23 + 70) + 13 x 93

= 87 x 93 + 13 x 93

= 93 x (87 + 13)

= 93 x 100

= 9300

Học tốt!!!