\(a,\left(16+x\right).25=1000\\ 16+x=1000:25\\ 16+x=40\\ x=40-16\\ x=24\\ ------\\ b,\left(700+x\right):36=12\\ 700+x=12.36\\ 700+x=432\\ x=432-700\\ x=-268\\ -----\\ c,2500:\left(x+5\right)=50\\ x+5=2500:50\\ x+5=50\\ x=50-5\\ x=45\\ ------\\ d,45.\left(x+20\right)=1350\\ x+20=1350:45\\ x+20=30\\ x=30-20\\ x=10\)
( 16 + x ) * 25 = 1000
=> 16 + x = 1000 : 25
=> 16 + x = 40
=> x = 40 - 16
=> x = 24
( 700 + x ) : 36 = 12
=> 700 +x = 12 * 36
=> 700 + x=432
=> x = 432 - 700
=> x =-268
2500 : ( x + 5 ) = 50
=> x + 5 = 2500 : 50
=> x + 5 = 50
=> x = 50 - 5
=> x = 45
45 * ( x +20 ) = 1350
=> x + 20 = 1350 : 45
=> x + 20 =30
=> x = 10
*) (16 + x) × 25 = 1000
16 + x = 1000 : 25
16 + x = 40
x = 40 - 16
x = 24
*) (700 + x) : 36 = 12
700 + x = 12 × 36
700 + x = 432
x = 432 - 700 (không thể thực hiện phép trừ này với lớp 5)
*) 2500 : (x + 5) = 50
x + 5 = 2500 : 50
x + 5 = 50
x = 50 - 5
x = 45
*) 45 × (x + 20) = 1350
x + 20 = 1350 : 45
x + 20 = 30
x = 30 - 20
x = 10
a,( 16 + x ) * 25 = 1000
=>16+x=1000:25
=>16+x=40
=>x=40-16
=>x=24
( 700 + x ) : 36 = 12
=>700+x=432
=>x=432-700
=>x=-268
c,2500 : ( x + 5 ) = 50
=>x+5=2500:50
=>x+5=50
=>x=50-5
=>x=45
d,45 * ( x +20 ) = 1350
=>x+20=1350:45
=>x+20=30
=>x=30-20
=>x=10
