Tìm x :
x : 5 = 1618 x : 4 = 1327
Tìm x
a) x – 6759 = 1327
b) x : 3 = 7826
c) 4 × x = 8412
d) x + 6942 = 7051 + 65
tính nhanh
234 x 1257 - 234 x257
1327 x 524 - 524 x327
325 x 1574 - 325 x325 - 325 x24
175 x 1274 - 175 x 273 - 175
a)=234(1257-257)
=234.1000
=234000
b)=524(1327-327)
=524.1000
=524000
c)=325(1574-325-24)
=325.1225
=398125
d)=175(1274-273-1)
=175.1000
=175000
234x (1257-257)= 234 x 1000 = 234000
1327 x 524 - 524 x 327 = 524 x (1327 - 327 ) = 524 x 1000 = 524000
325x1574 - 325 x 325 -325 x24 =325 x(1574 - 325 - 24 )= 325 x 1225 =398125
175 x 1274 - 175 x273 -175 = 175 x (1274 - 273 -1) = 175 x 1000= 175000
kkk mk nha bạn !!!!!!!!
a)234 x 1257 - 234 x257
= 234 x (1257 - 257)
= 234 x 1000
= 234000
b)1327 x 524 - 524 x327
= 524 x (1327 - 327)
=524 x 1000
=524000
c)325 x 1574 - 325 x325 - 325 x24
= 325 x (1574 -325 - 24)
=325 x 1225
=325 x 1000+325 x 100 +325 x125
=325000+32500+40625
=390125
d)175 x 1274 - 175 x 273 - 175
=175 x (1274-273-1)
=175 x 1000
=175000
1.tính nhanh
425×3475+425×6525
234 x 1257 - 234 x 257
3876 x 375 + 375 x 6124
1327 x 524 - 524 x 327
257 x 432 + 257 x 354 + 257 x 214
325 x 1574 - 325 x 325 - 325 x 249
312 x 425 + 312 x 574 + 312
175 x 1274 - 175 x 273 - 175
Tìm x:
a) x - 4/5 = ( 4/7 + 1/7 ) x 7/5 b) x - 1/5 = 7/5 x 1/4 + 8/5 x 1/4
Tìm x :
a) x − 4 = 2
x : 4 = 2
b) x − 5 = 4
x : 5 = 4
c) x − 3 = 3
x : 3 = 3
Phương pháp giải:
- Muốn tìm số bị trừ ta lấy hiệu cộng với số trừ.
- Muốn tìm số bị chia ta lấy thương nhân với số chia.
Lời giải chi tiết:
a)
● x − 4 = 2
x = 2 + 4
x = 6
● x : 4 = 2
x = 2 × 4
x = 8
b)
● x − 5 = 4
x = 4 + 5
x = 9
● x : 5 = 4
x = 4 × 5
x = 20
c)
● x − 3 = 3
x = 3 + 3
x = 6
● x : 3 = 3
x = 3 × 3
x = 9
Tìm x:
X : 2 = 7
X : 5 = 4
X : 4 = 5
- x : 2 = 7
X = 7 × 2
X = 14
- x : 5 = 4
X = 4 × 5
X = 20
- x : 4 = 5
X = 5 × 4
X = 20
tìm X
X - 6/5 = 3/4 : 3/16 X x 4/5 = 3/4 + 2/5
X - 6/5 = 4
X = 4 + 6/5
X= 26/5
X x 4/5 = 23/20
X = 23/20 : 4/5
X = 23/16
Tìm x
(2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4)
\(\left(2x+3\right)\left(x-4\right)+\left(x-5\right)\left(x-2\right)=\left(3x-5\right)\left(x-4\right)\)
\(\Rightarrow2x^2-5x-12+x^2-7x+10=3x^2-17x+20\)
\(\Rightarrow5x=22\Rightarrow x=\dfrac{22}{5}\)
Ta có: \(\left(2x+3\right)\left(x-4\right)+\left(x-5\right)\left(x-2\right)=\left(3x-5\right)\left(x-4\right)\)
\(\Leftrightarrow2x^2-8x+3x-12+x^2-7x+10=3x^2-12x-5x+20\)
\(\Leftrightarrow3x^2-12x-2=3x^2-17x+20\)
\(\Leftrightarrow5x=22\)
hay \(x=\dfrac{22}{5}\)
(2x+3)(x-4)+(x-5)(x-2) = (3x-5)(x-4)
Tìm x
\(\Leftrightarrow2x^2-5x-12+x^2-7x+10=3x^2-17x+20\\ \Leftrightarrow5x=22\\ \Leftrightarrow x=\dfrac{22}{5}\)
\(\left(2x+3\right)\left(x-4\right)+\left(x-5\right)\left(x-2\right)=\left(3x-5\right)\left(x-4\right)\)
\(2x^2-8x+3x-12+x^2-2x-5x+10-3x^2+12x+5x-20=0\)
\(5x-22=0\)
\(x=\dfrac{22}{5}\)