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trả lời
17+26×89/29+89-250=-64,206....( chắc vậy )
chúc bn
hc tốt
trả lời
17+26×89/29+89-250=-64,206....
chúc bn
hc tốt
Bài 2:
a: =>3x=-15
hay x=-5
b: =>3x-27=2x+11
=>x=38
c: \(\Leftrightarrow2x^2=32\)
\(\Leftrightarrow x^2=16\)
=>x=4 hoặc x=-4
d: =>-12x+60+21-7x=15
=>-19x+81=15
=>-19x=-66
hay x=66/19
\(A=\)\(\frac{1}{2}+\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+\frac{29}{30}+\frac{41}{42}+\frac{55}{56}+\frac{71}{72}+\frac{89}{90}\)
\(A=\)\(1-\frac{1}{2}+1-\frac{1}{6}+1-\frac{1}{12}+1-\frac{1}{20}+1-\frac{1}{30}+1-\frac{1}{42}+1-\frac{1}{56}+1-\frac{1}{72}+1-\frac{1}{90}\)
\(A=\)\(9-\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)
\(A=\)\(9-\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\right)\)
\(A=\)\(9-\left(1-\frac{1}{10}\right)\)
\(A=\)\(9-\frac{9}{10}\)
\(A=\)\(\frac{81}{10}\)
A=(1-1/2)+(1-1/6)+...+(1-89/90)
A=1x9-(1/2+1/6+...+1/90)
A=9-(1/1x2+1/2x3+...+1/9x10)
A=9-(1-1/2+1/2-1/3+1/3+...+1/9 -1/10)
A=9-(1-1/10)
A=9-9/10
A=81/10=8,1
hok tốt nhé
1045 + 57 - 1045 - 67
= ( 1045 - 1045 ) + ( 57 - 67 ) [_Tự lm tiếp_]
1890 - 456 - 434
= 1890 - ( 456 + 434 )
= 1890 - 890 [_Tự lm tiếp_]
-45 + 189 - 155
= 189 - ( 45 + 155 )
= 189 - 200 [_Tự lm tiếp_]
-127 + 34 - 73 + 166
= ( -127 + -73 ) + ( 34 + 166 ) [_Tự lm tiếp_]
-15 - 17 + 29 + 15 - 83
= ( -15 + 15 ) - ( 17 - 29 + 83 ) [_Tự lm tiếp_]
-45 + 140 - (-45) - 240
= [ -45 - ( -45 ) ] + ( 140 - 240 ) [_Tự lm tiếp_]
-75 + (-89) + (-75) + 89 - 122
= [ -75 + ( -75 ) ] + [ ( -89 ) + 89 ] - 122 [_Tự lm tiếp_]
P/s: Hoq chắc_:333
\(=6+6+6+...+6\)
Tổng có \(\left[\left(95-5\right):6+1\right]:2=8\left(\text{số hạng }6\right)\)
Vậy tổng là \(8\cdot6=48\)
Q=\(\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+\frac{29}{30}+\frac{41}{42}+\frac{55}{56}+\frac{89}{90}\)
Q=\(Q=\frac{5}{2.3}+\frac{11}{3.4}+\frac{19}{4.5}+\frac{29}{5.6}+\frac{41}{6.7}+\frac{55}{7.8}+\frac{71}{8.9}+\frac{89}{9.10}\)
Q=
a) -23/-17 = 23/17
-13/-17 = 13/17
Vì 23>13 => 23/17>13/17
Vậy -23/-17>-13/-17
b) -57/53 = -5301/4929
-97/93 = -5141/4929
Vì -5301<-5141 => -5141/4929< -5301/4929
Vậy -97/93<-57/53
c) 81/-89 = -81/89
-21/29 = -1869/2581
-81/89 = -2349/2581
Vì -1869>-2349 => -2349/2581>-1869/2581
Vậy 81/-89>-21/29
17 + 26 x 89 =2331
29 + 89 -250 =-133
~Hok tốt~
17 + 26 x 89
= 17 + 2314
= 2331
29 + 89 - 250
= 118 - 250
= - 132