72 - x - 15 = 34
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a ) x ∈ ± 23 28 . b ) x ∈ − 23 6 ; 35 6 . c ) x ∈ − 17 60 ; 97 60 . d ) x ∈ 67 140 ; 143 140 .
a,(x-15)-75=0
x-15 =75
x =75+15
x =90
b,72-(6.x+5)=55
6.x+5=72-55
6.x+5=17
6.x=17-5
6.x=12
x=12:6
x=2
c,575-(6.x+70)=445
6.x+70=575-445
6.x+70=130
6.x=130-70
6.x=60
x=60:6
x=10
d,(x-34).15=0
x-34=0
x=34
e,15+(18-x)=26
18-x=26-15
18-x=11
x=18-11
x=7
g,(x-5):16=2
x-5=2.16
x-5=32
x=32+5
x=37
a: =25x100-150=2500-150=2350
c: \(=520:\left\{515\cdot25\right\}\)
=104/2575
\(\left(527-34\right)+\left(-150+34-527\right)\)
\(=527-34-150+34-527=\left(527-527\right)+\left(-34+34\right)-150=-150\)
\(367+\left|-550\right|+\left|-33\right|-248-\left|-202\right|\)
\(=367+550+33-248-202=\left(367+33\right)-\left(248+202\right)+550=500\)
\(231.72+769.87+231.15=231\left(72+15\right)+769.87=87\left(231+769\right)=87000\)
a)5.(-8).2.(-3)
=[5.(-2)].[(-8).(-3)]
=-10.24
=-240
b)(45-135+72)-(45+72)
=45-135+72-45-72
=(45-45)+(72-72)-135
=0+0-135
=-135
c)3.(-5)2.2+2.(-5)-20
=3.25.2+2(-5)-20
=75.2+(-10)-20
=150+(-30)
=120
d)86.(-46)+46.27-46.41
=86.(-1).46+46.27-46.41
=-86.46+46.27-46.41
=46(-86+27-41)
=46(-100)
-4600
e)34(15-10)-15(34-10)
=34.15-34.10-15.34+15.10
=(34.15-15.34)+(15.10-34.10)
=[34(15-15)]+[10(15-34)]
=34.0+10(-9)
=0+(-90)
=-90
a) 2x + 34 = 72
2x=38
x=19
b) (4+x) . 2 phần 3 =9
4+x=\(\frac{27}{2}\)
x=\(\frac{19}{2}\)
c) (2x + 1 ) 3 =36
2x+1=12
2x=11
x=\(\frac{11}{2}\)
d ) (x + 5 ) : 4 =12
x+5=48
x=43
e ) 1 phần 2 x -- 4 = 15
\(\frac{1}{2}x\)=19
x=38
1 + 1 + 5 - 7 + 8 + 2 = 10
34 x 1 = 34
7 x 10 = 70
9 - ( 1 + 4 ) = 4
15 + 17 = 32
56 x 9 = 504
72 x 6 - 99 = 333
1 + 1 +5 - 7 + 8 +2
= 2+5-7+8+2
=0+8+2
=10
34 x 1=34
7x10 = 70
9-( 1+4)
=9-5
=4
56x 9 =504
72 x 6+ -99=333
k cho mình nhé
72 - x - 15 = 34
72 - x = 34 + 15
72 - x = 49
x = 72 - 49
x = 23
72-x-15=34
72-x=34+15
72-x=49
x=72-49
x=23