7x-2x-1952=2500-1947
=> 5x-1952=553
=> 5x =553+1952
=> 5x=2505
=> x =2505:5
=> x =501
7x-2x-1952=2500-1947
=> 5x-1952=553
=> 5x =553+1952
=> 5x=2505
=> x =2505:5
=> x =501
7x-2x-1952=2500-1947
Tìm y biết:
a/y:6=2010:15 b/ x+1/2=3/4 c/x-1/3=1/4 d/3x+3/8=1/2
e/ 5.y - 1952=2500-1947 f/(8.y - 1942). 1947=(240 - 194,2). 19470
2195. 1952 - 952 . 427 - 1952 . 1768
tính nhanh
Tìm số tự nhiên x, biết:
1 + 3 + 5 + ........... + (2x +1) = 2500
Tính nhanh:
2195 . 1952 - 952 . 247 - 1952 . 1768
98 . 7676 - 9898 . 76
123 . 456456 - 456 . 123123
1 . 25 x { 32 : [ 12 - 4 + 4 x ( 16 : 8 ) ] }
2. 2195 x 1952 - 952 x 427 - 1952 x 1768
Tìm số tự nhiên x, biết:
100 - ( 2x - 1 ) = 2500 . ( 22 . 53 )
rut gon
a,3x(2x-7)-3x(4x-5)
b,(-7x+8)(-2x+3)-7x(2x-4)
c,(2x-3)(3x2-2x+4)-(2x-3)(3x+4)
d,(-2+7)(3x-6)-(4x-5)(2x-6)
tim x
-2x(6x-2)+3x(4x-7)=8
(7x-2)(2x+3)-(3x-5)(4x+6)=2x2-5
+(-2x+3)-6x(3x-4)=-22x2+7x