Question

 

 

Cíu 2 bài này

Answer 1

B3

\(a.\left(x-25\right)-175=0\\ x-\left(25+175\right)=0\\ x-200=0\\ x=200\\ b.315+\left(135-x\right)=450\\ \left(315+135\right)-x=450\\ 500-x=450\\ x=500-450\\ x=50\\ c.346+\left(210-x\right)=556\\ \left(346+210\right)-x=556\\ 556-x=556\\ x=0\\ d.x\cdot14-x\cdot2=120\\ x\cdot12=120\\ x=120:12\\ x=10\\ e,x\cdot5+10\cdot9=990\\ x\cdot5+90=990\\ x\cdot5=990-90\\ x\cdot5=900\\ x=900:5\\ x=180\\ f.x\cdot34-x\cdot14=200\\ x\cdot20=200\\ x=200:20\\ x=10\)

 

Answer 2

Bài 2

a	328	141	15	982	1005
b	32	12	4	47	40
q	10	11	3	20	25
r	8	9	3	42	5

Cột cuối có thể có b = 39, r = 30