x + 30 = 90 - 10
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a)5+10=30-x
=>15=30-x
=>x=30-15
=>x=15
b)10+40=90-x
=>50=90-x
=>x=90-50
=>x=40
\(5+10=30-x\)
\(15=30-x\)
\(x=15\)
\(10+40=90-x\)
\(50=90-x\)
\(x=40\)
30 + x = 40 + 60
30 + x = 100
x = 100 - 30
x = 70
10 + 90 = 40 + x
100 = 40 + x
x = 100 - 40
x = 60
30+x=40+60
30+x=100
x=100-30
x=70
10+90=40+x
100 =40+x
100-40=x
60 =x
Lời giải chi tiết:
30 + 20 = 50 | 50 – 30 = 20 | 60 + 30 = 90 |
60 + 10 = 70 | 70 – 40 = 30 | 90 – 60 = 30 |
40 + 40 = 80 | 90 – 50 = 40 | 90 – 30 = 60 |
30=20=50 50-30=20 60+30=90 60+10=70 70-40=30 90-60=30
kết quả đó nha nhỏ
a) 90 – ( 30 – 20) = 90 – 10
= 80
90 – 30 – 20 = 60 - 20
= 40
b) 100 – (60 + 10) = 100 – 70
= 30
100 - 60 + 10 = 40 + 10
= 50
c) 135 – (30 + 5) = 135 – 35
= 100
135 – 30 – 5 = 105 – 5
= 100
d) 70 + (40 – 10) = 70 + 30
= 100
70 + 40 – 10 = 110 -10
= 100
70 – 10 – 20 = 40 70 – 30 = 40 |
90 – 30 – 20 = 40 90 – 50 = 40 |
80 – 30 – 10 = 40 80 – 40 = 40 |
|
80 + 10 = 90 30 + 40 = 70 80 + 5 = 85
90 - 80 = 10 70 - 30 = 40 85 - 5 = 80
90 - 10 = 80 70 - 40 = 30 85 - 80 = 5
80+10=90 30+40=70 80+5=85
90-80=10 70-30=40 85-5=80
90-10=80 70-40=30 85-80=5
a, 10 x 7 = 70
20 x 4= 80
40 x 2 = 80
30 x 3= 90
b, 60:=2=30
70:7=10
90:3=30
40:2=20
a) 10 x 7=70
20 x 4=80
40 x 2=80
30 x 3=9-
b) 60:2=30
90:3=30
70:7=10
40:2=20
\(\dfrac{3x-40}{50}+\dfrac{3x-10+2x+60+4x-360}{40}=0\)
=> \(\dfrac{3x-40}{50}+\dfrac{9x-310}{40}=0\)
=> \(\dfrac{3x-40}{50}=\dfrac{-9x+310}{40}\)
=> \(40\left(3x-40\right)=50\left(-9x+310\right)\)
=> \(120x-1600=-450x+15500\)
=> \(120x+450x=15500+1600\)
Hay \(570x=17100\)
=>x = 30
Hơi dài nhé bạn
\(\dfrac{3x-40}{50}\)+\(\dfrac{3x-10+2x+60+4x-360}{40}\)=0
⇒\(\dfrac{3x-40}{50}\)+\(\dfrac{9x-310}{40}\)=0
⇒\(\dfrac{3x-40}{50}\)=\(\dfrac{9x-310}{40}\)
⇒40(3x -40) = 50(-9x+310)
⇒120x - 1600 = -450x + 15500
⇒120x + 450x = 15500 + 1600
Mặt khác: 570x = 17100
⇒x = 30
x + 30 = 90 - 10
x + 30 = 80
x = 80 - 30
x = 50
tk mk mk tk lai
\(x+30=90-10\)
\(x+30=80\)
\(x=80-30\)
\(x=50\)