trim x: a)x*101-x=72000
giúp với: X x 670 x x + 329 x x = 72000
\(x\times670+x\times329\times x=72000\)
\(x\times670+x\times329+x\times1=72000\)
\(x\times\left(670+329+1\right)=72000\)
\(x\times1000=72000\)
\(x=72000\div1000\)
\(x=72\)
9 x 9 x9 x 9 x 9 x 9 : 70 x 10000 : 720 x 72000
a (72000+18000)-(3.x-3000)=12000
(72000+18000)-(3.x-3000)=12000
=90000-(3.x-3000)=12000
=3.x-3000=90000-12000
=3.x-3000=78000
=3.x=78000+3000
=3.x=81000
x= 81000:3
x= 27000
tk nhé
x=27000 nhé bạn
tk cho mình rồi kết bạn nhé !!!
Tính nhẩm
a) 50000 + 40000 = .......................
90000 - 20000 = .......................
b) 42000 + 6000 = .......................
86000 - 2000 = .......................
c) 40000 x 2 = .......................
80000 : 4 = .......................
d) 12000 x 3 = 3.......................
72000 : 8 = .......................
a) 50000 + 40000 = 90 000
90000 - 20000 = 70000
b) 42000 + 6000 = 48000
86000 - 2000 = 84000
c) 40000 x 2 = 80000
80000 : 4 = 20000
d) 12000 x 3 = 36000
72000 : 8 = 9000
90000
70000
48000
84000
80000
16000
9000
1.Tìm X
30*X=22800:40
(x*30):40=840
372000:x=60*5
(72000:x):60=5
a/30.x=2280040
30.x=570
x=570:30=19
b/(x.30):40=840
x.30 =840.40
x.30 =33600
x =33600:30=1120
c/37200:x=60.5
37200:x=300
x=37200:300=124
d/(72000:x):60=5
72000:x =5.60
72000:x =300
x =72000:300=240
Cho don thuc A=(-2xy)-4/5x^2y^3 a,Thu gon don thuc tren ,cho biet phan he so va phan bien ,tim bac cua don thuc b,Tinh gia trim cua don thuc tai x=1,y=-1
a, P=-3(x^3.x)(y^2.y^3)
=-3x^4y^5
b, Thay x=-1 , y=2 vào đơn thức P . Ta có :
P=-3.(-1)^4.2^5
P=3.1.32
P=96
Cho don thuc A=(-2xy)-4/5x^2y^3 a,Thu gon don thuc tren ,cho biet phan he so va phan bien ,tim bac cua don thuc b,Tinh gia trim cua don thuc tai x=1,y=-1
a, / x + 1 tren 101 / + / x + 2 tren 101 / + / x + 3 tren 101 / + ....+ / x + 100 tren 101 / = 101x
Bài 1: Tính nhanh
A, 13 x 126 + 37 x 126 - 49 x 126
B, ( 1 + 2 + 4 + 8+.....+ 512 ) x ( 101 x 102 - 101 x 101 - 50 - 51 )
Bài 1: Tính nhanh
A, 13 x 126 + 37 x 126 - 49 x 126
= 126 x ( 13 + 49 - 49 )
= 126 x 1
= 126
B, ( 1 + 2 + 4 + 8+.....+ 512 ) x ( 101 x 102 - 101 x 101 - 50 - 51 )
= ( 1 + 2 + 4 + 8+.....+ 512 ) x ( 101 x ( 102 - 101 - 1))
= ( 1 + 2 + 4 + 8+.....+ 512 ) x ( 101 x 0)
= ( 1 + 2 + 4 + 8+.....+ 512 ) x 0
= 0