12-x+4=1452,524
12-x=1452,524-4
12-x=1448,524
x=12-1448,524
x=-1436,524
12-x+4=1452,524
=>12-x=1452,524-4
=>12-x=1448,524
=>x=12-1448,524
=>x=-1436,524
12-x+4=1452,524
12-x=1452,524-4
12-x=1448,524
x=12-1448,524
x=-1436,524
12-x+4=1452,524
12-x=1452,524-4
12-x=1448,524
x=12-1448,524
x=-1436,524
12-x+4=1452,524
=>12-x=1452,524-4
=>12-x=1448,524
=>x=12-1448,524
=>x=-1436,524
12-x+4=1452,524
12-x=1452,524-4
12-x=1448,524
x=12-1448,524
x=-1436,524
Tính nhanh:
A = ( 12 x 2 + 12 x 4 +12 x 6 ) : ( 2 + 4 + .......... + 12 + 14 )
2 x 6 = .....; 3 x 4 = .....; 4 x 9 = .....; 5 x 8 = .....?
A. 8; 7; 13; 13
B. 12; 12; 36; 40
C. 11; 13; 35; 41
D. 12; 12; 38; 30
Tính nhanh
Ạ) ( 12 x 2 + 12 x 4 - 12 x 6) : ( 2 + 4 + 6 +... + 12 + 14)
b) 37 x 49 + 37 x 2 x 25 + 37
12 x ( x - 6) = 4.x +12
Tính:
3 giờ 12 phút x 3
4 giờ 23 phút x 4
12 phút 25 giây x 5
tính nhanh
25/37 x 18/29 + 18/29 x 12/37
31/85 x 11/19 + 31/85 x 12/19 - 42/19 x 31/85
c , 16/53 : 17/9 - 16/53 : 17/8
1/5 x 12/31 x 4/3 + 19/31 x 4/15
12*(x-6)=4*x+12
12*(x-6)=4*x+12
12×(x-6)=4×x+12