Tính hợp lý( nếu có thể):
15x( 17- 111)- 17x( 222+ 15).
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20.(17-111)-17.(222+20)
=20.(-94)-17.242
=(-1880)-4114
=-5994
tick nha bạn
15.(17-111)-17.(222+15)
=15.17+15.111-17.15-17.222
=15.17+15.11-17.15-17.2.111
=15.17+15.11-17.15-34.111
=[15.17-15.17]+[111.(15-34)]
=0+111.(-19)
=-2109
15 .(17-111)-17.(222+15)
= 15.17 - 15.111 - 17.222 -17.15
= 17.15 - 17.15 - 15.111 - 17.2.111
= 111( -15 - 17.2 )
= 111 . (-49)
= 5439
a) 17 + 15 + (-27)
= (17 - 27) + 15
= -10 + 15
= 5
b) 13.75 + 25.13 - 300
= 13.(75 + 26) - 300
= 13.100 - 300
= 1300 - 300
= 1000
c) 80 - (4.5² - 5.2³) + 2021⁰
= 80 - (4.25 - 5.8) + 1
= 80 - (100 - 40) + 1
= 80 - 60 + 1
= 20 + 1
= 21
\(\text{-567-(-113)+(-69)-(113-567)}\)
=\(-567+113-69-113+567\)
=\(\left(-567+567\right)\left(113-113\right)-69\)
=\(-69\)
\(\text{15.(17-111)-17.(22+15)}\)
\(=225-1665-3774-225\)
\(=\)\(\left(225-225\right)-\left(1665+3774\right)\)
\(=0-5439=-5439\)
= 249.17-249.111-17.3.111+17.51
= 17.(249+51)-249.111-111.51
= 17.300-111.(249+51)
= 17.300-111.300
= 300.(17-111)
= 300.(-94)
= -28200
Tk mk nha
a) \(199\left(15-17\right)-199\left(-17+5\right)\)
\(=199.15-199.17+199.17-199.5\)
\(=199.\left(15-5\right)\)
\(=199.10=1990\)
b) \(73\left(8-59\right)-59\left(8-73\right)\)
\(=73.8-73.59-59.8+59.73\)
\(=8\left(73-59\right)\)
\(=8.14=112\)
Câu 9
a) 2/15 + (-3/5)
= 2/15 - 3/5
= 2/15 - 9/15
= -7/15
b) -5/7 + 3/7 . (-2/9)
= -5/7 - 2/21
= -15/21 - 2/21
= -17/21
c) 5/16 - (7/15 - 3/16) + 17/30
= 5/16 - 7/15 + 3/16 + 17/30
= (5/16 + 3/16) + (17/30 - 14/30)
= 1/2 + 1/10
= 5/10 + 1/10
= 6/10
= 3/5
\(a,\dfrac{2}{15}+\left(-\dfrac{3}{5}\right)\\ =\dfrac{2}{15}-\dfrac{3}{5}\\ =\dfrac{2}{15}-\dfrac{9}{15}\\ =-\dfrac{7}{15}\\ b,-\dfrac{5}{7}+\dfrac{3}{7}\times\left(-\dfrac{2}{9}\right)\\ =-\dfrac{5}{7}-\dfrac{2}{21}\\ =-\dfrac{15}{21}-\dfrac{2}{21}\\ =-\dfrac{17}{21}\\ c,\dfrac{5}{16}-\left(\dfrac{7}{15}-\dfrac{3}{16}\right)+\dfrac{17}{30}\\ =\dfrac{5}{16}-\dfrac{7}{15}+\dfrac{3}{16}+\dfrac{17}{30}\\ =\left(\dfrac{5}{16}+\dfrac{3}{16}\right)-\left(\dfrac{17}{15}+\dfrac{17}{30}\right)\\ =\dfrac{1}{2}-\dfrac{17}{10}\\ =\dfrac{5}{10}-\dfrac{17}{10}\\ =-\dfrac{6}{5}.\)
15.(17-111)-17.(222+15)
=15.17-15.111-17.2.111-17.15
=(15.17-15.17)-111.(15+17.2)
=0-111.49
=-5439
15 x (17 - 111) - 17 x (222 + 15)
= 15 x (17 - 111) - 15 x (222 + 15) - 2 x (222 + 15)
= \(15.\left[\left(17-111\right)-\left(222+15\right)\right]-2.\left(222+15\right)\)
= \(15.\left[17-111-222-15\right]-2.\left(222+15\right)\)
= \(15.\left[-331\right]-2.237\)
= \(-4965-474\)
= \(-5439\)
có một chút sự sai nhẹ!!!
nhưng hãy nhé.