a , x = − 6532 x = − 8965 x = 8520 b , x = 7984 x = 465 x = − 645
a , x = − 6532 x = − 8965 x = 8520 b , x = 7984 x = 465 x = − 645
Tính:
a , − 13. x − 645 . x + 613 = 0 b , 651. x − 12 . x + 946 = 0
Tính:
a , − 551. − x − 642 . x + 4563 . x − 6431 = 0 b , − − 465 . x − 4132 . − x + 4523 . − x − 6212 = 0
Tính :
a) 645 - ( 27 + x ) - 342 = 123
b) ! x ! + 87 = 123
c) ! x - 12 ! = 42
1. Tìm x biết :
a) ( x+1 ) + ( x+3 ) + ......+ ( x+ 99 ) = 0
b) 2016 - 100. ( x +11 ) = 27: 2
c) 1+2+3+....+x = 465
Bài 3 : Bỏ ngoặc rồi tính
a, ( 258 - 79 ) - ( 111 - 90 )
b, ( 617 - 304 ) - ( 617 + 254 )
c, ( 217 - 372 ) - ( 217 - 465 ) - ( 465 + 372 )
d, ( x + y + z + t ) - ( x + y + z - t ) - ( y + z + t - x ) - ( z + t + x - y ) - ( t + x + y - z)
Tìm x thuộc Z:
a,x+(x+1)+(x+2)+...+(x+999)=0
b,(x-281)+(x-280)+(x-279)+...+321+322=322
c,|x+1|+|x+2|+...+|x+2018|=2019x
Ai nhanh mk k
1 ) tính hợp lí
a. 59 + 296
b) 592 + 48 )
d) 277+ 113 + 323 + 87
e) 36 x 28 + 36 x 82 + 64 x 68 + 64 x42
g ) 8 x 9 x 14 + 6 x7 x12 + 19 x 4 x18
h) 98 x 31 + 62
i ) 1 + 3 + 5 +7 +.....+ 27 + 29
2 ) tim x
a) 135 - 5 x ( x +4 ) = 38
b ) X x ( x - 10 ) = 0
c ) ( 2 x X - 4 ) x ( x + 2 ) = 0
A,3(X-5)+6=36
B,200-8(X+7)=24
C,(X-890).(74-X)=0
D,(31-X)(X-64)=0
tính hợp lí
a) 135 x (-27) + 27 x 235
b) 36 x (-125) - 125 x (-46)
c) 32 x (-64) - 64 x 68
d) (145 - 45) x (-31) + 31 x (-100)