(x-16)+34=58
16/58 + -4/17+-4/29+-42/-34+(-2)
\(=\dfrac{8}{29}-\dfrac{4}{29}+\dfrac{-4}{17}+\dfrac{21}{17}-2=\dfrac{4}{29}-1=-\dfrac{25}{29}\)
Thực hiện phép tính:
a) 3 8 + − 5 8 − 1 8
b) 3 4 − − 1 2 + 1 6
a) 3 8 + − 5 8 − 1 8 = 3 − 5 − 1 8 = − 3 8
b) 3 4 − − 1 2 + 1 6 = 9 12 + 6 12 + 2 12 = 17 12
a) 415+[58+(-415) + (-38)]
b)34+35+36+37-14-15-16-17
\(a.=415+58-415-38\)
\(=\left(415-415\right)+\left(58-38\right)\)
\(=0+30\)
\(=30\)
\(b.=\left(34-14\right)+\left(35-15\right)+\left(36-16\right)+\left(37-17\right)\)
\(=20+20+20+20\)
\(=80\)
Tính
1) 5 8 − − 2 5 − 3 10
2) − 5 12 + 4 37 + 17 12 − 41 37
3) − 1 3 − − 3 5 − 1 6 + 1 43 − − 3 7 + − 1 2 − 1 15
4) 3 4 − − 5 3 − 1 12 + 2 9
Tính: 6 x 5 8 + 3 4
\(\dfrac{15}{17}\) x \(\dfrac{34}{5}\) < x < \(\dfrac{62}{15}\) + \(\dfrac{58}{15}\)
\(\dfrac{20}{29}\) x \(\dfrac{58}{5}\) < x < \(\dfrac{75}{11}\) + \(\dfrac{37}{11}\)
a: =>15/5*34/17<x<120/15
=>6<x<8
=>x=7
b; =>20/5*58/29<x<112/11
=>8<x<112/11
=>x=9 hoặc x=10
tim x :
36 + x + 23 = 34 + 58
36 + x + 23 = 34 + 58
36 + x + 23 = 92
x + 23 = 92 - 36
x + 23 = 56
x = 56 - 23
x = 33
36 + x + 23 = 34 + 58
36 + x + 23 = 92
36 + x = 92 - 23
36 + x = 69
x = 69 - 36
x = 33
k mình nhé!
36 + x + 23 = 92
36 + x = 92 -23
36 + x = 69
x = 69 - 36
x = 33
đúng 100%
tk mk nha
chúc bạn học tốt
bài 1:tính
a) 21+22+23+24-11-12-13-14
b) 34+35+36+37-14-15-16-17
c) 55+56+57+58-35-36-37-38
mik cần câu trả lời đúng nhất ❗
a: =(21-11)+(22-12)+(23-13)+(24-14)
=10+10+10+10
=40
b: =(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20
=80
a, =(21-11)+(22-12)+(23-13)+(24-14)
=10+10+10+10
=40
b. =(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20
=80
c,55+56+57+58-35-36-37-38
=111+57+58-35-36-37-38
=168+58-35-36-37-38
=226-35-36-37-38
=191-36-37-38
=155-37-38
=118-38
=80
a, 35 x 34 + 35 x 38 + 65 x 75 + 45 x 65
b, 39 x 8 + 60 x 2 + 21 x 8
c, 58 x 75 + 58 x 50 - 58 + 25
d, 125 x 98 - 125 x 46 - 52 x 25
a.35 x 34 + 35 x 38 + 65 x 75 + 45 x 65
= 35 x (34 + 38) + 65 x 75 + 65 x 45
= 35 x 72 + 65 x (75+45)
= 35 x 72 + 65 x 120
= 35 x 72 + 65 x (72 + 48)
= 35 x 72 + 65 x 72 + 65 x 48
= (35+65) x 72 + 65 x 48
= 100 x 72 + 65 x 48
= 7200 + 3120
= 10320
b.39 x 8 + 60 x 2 + 21 x 8
=39 x 8 + 15 x 4 x 2 +21 x 8
= 39 x 8 + 15 x 8 + 21 x 8
=(39 + 15 + 21) x 8
= 75 x 8
= 600
c.58 x 75 + 58 x 50 - 58 + 25
= 58 x 75 + 58 x 50 - 58 x 1 + 25
= 58 x(75+50-1)+25
= 58 x 124 + 25
= 7192 + 25
= 7217
d.125 x 98 - 125 x 46 - 52 x 25
= 25 x 5 x 98 - 25 x 5 x 46 - 25 x 52
= 25 x 490 - 25 x 230 - 25 x 52
= 25 x (490 - 230 - 52)
= 25 x 208
= 5200