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a. 48.19+48.115+134.52= 48.(19+115)+134.52= 48.134+134.52= 134.(48+52)= 134.100=13400
b. 27.121-87.27+73.34= 27.(121-87)+73.34= 27.34+73.34= 34.(27+73)= 34.100= 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= 116.(17+83)= 116.100=1600
f. 35.23+35.41+64.65=35.(23+41)+64.65= 35.64+64.65= (35+65).64= 100.64=6400
12.35 + 35.182 - 35.94
=35 x ( 12 + 182 -94 )
= 35 x 100
= 3500
\(12.35+35.182-35.94\)
\(=35.\left(12+182-94\right)\)
\(=35.100\)
\(=3500\)
Ủng hộ tớ nha m.n
19.27 + 47.81 + 19.20
= 19 .( 27 + 20) + 47.81
= 19 . 47 + 47 .81
= 47 .( 19+81)
= 47.100
= 4700
a)48*(19+115)+134*52
48 *134 +134*52
134*(48+52)
134*100
13400
12 , 35 : 0 , 5 + 12 , 35 : 0 , 25 + 12 , 35 : 0 , 125
= 12 , 35 x 2 + 12 , 35 x 4 + 12 , 35 x 8
= 12 , 35 x ( 2 + 8 ) + 12 , 35 x 4
= 12 , 35 x 10 + 49 , 4
= 123 , 5 + 49 , 4
= 172 , 9
Tk mk nha !!!
12,35 : 0,5 + 12,35 : 0,25 + 12,35 : 0,125 = 12,35 x 2 + 12,35 x 4 + 12,35 x 8
= 12,35 x ( 2 + 4 + 8 )
= 12,35 x 14
= 172,9
\(\frac{1}{5.6}+\frac{1}{6.7}+...+\frac{1}{19.20}\)
\(=\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+...+\frac{1}{19}-\frac{1}{20}\)
\(=\frac{1}{5}-\frac{1}{20}\)
\(=\frac{4}{20}-\frac{1}{20}=\frac{3}{20}\)
\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+..+\frac{1}{19.20}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{19}-\frac{1}{20}\)
\(=1-\frac{1}{20}=\frac{19}{20}\)
=1-1/2+1/2-1/3+1/3-1/4+.........+1/18-1/19+1/19-1/20
=1-1/20
=19/20
66(25+5+14+33)
66.77=5082
136(23+17)-40.36
=136.40-40.36
=40(136-36)
=40.100=4000
35(12+182-94)
35.100=3500
17(93+23)+116.83
=17.116+116.83
=116(17+83)
=116.100=11600
d) 66.25 + 5.66 + 66.14 + 33.66 = 66 . ( 25 + 5 + 14 +33 ) = 66 . 77 = 5082
i) 136.23 + 136.17 – 40.36 = 136 . (23 + 17) -40.36 = 136. 40 - 40 . 36 = 40 (136-36) = 40 . 100 = 4 000
e) 12.35 + 35.182 – 35.94 =35.(12 +182-94) = 35 . 100 = 3 500
j) 17.93 + 116.83 + 17.23 = 17. ( 93+23) +116.83 = 17 . 116 + 116 . 83 = 116. (17 + 83 ) = 116 . 100 = 11 600
m) 19.27 + 47.81 + 19.20 = 19.(27+20) + 47.81 = 19 . 47 + 47 . 81 = 47. (19 + 81) = 47 .100 = 4 700
19.(27+20)+47.81
=19.47+47.81
=47(19+81)
=47.100=4700