Tìm X
(X : 10) + 37 = 60 25 x X – 15 x X = 72
138 – ( X x 5) = 38 (X x 9) : 52 = 18
52 x X + 48 x X = 100 623 x X – 123 x X = 1000
X x 16 + 84 x X = 700 236 x X – X x 36 = 2000
216 : X + 34 : X = 10 2125 : X – 125 : X = 100
$(x \div 10)+37=60 \Leftrightarrow x \div 10 =60-37=23 \Leftrightarrow x=23 \times 10=230$
$138-(x \times 5)=38 \Leftrightarrow x \times 5=138-38=100 \Leftrightarrow x=100 \div 5=20$
$52 \times x+48 \times x =100 \Leftrightarrow x \times (52+48)=100 \Leftrightarrow x \times 100=100 \Leftrightarrow x=100 \div 100=1$
$x \times 16+84 \times x =700 \Leftrightarrow x \times (84+16)=700 \Leftrightarrow x \times 100=700 \Leftrightarrow x=700 \div 100=7$
$216 \div x+84 \times x =10 \Leftrightarrow (216+84) \div x=10 \Leftrightarrow 300 \div x=100 \Leftrightarrow x=300 \div 100=3$
$25 \times x-15 \times x =72 \Leftrightarrow x \times (25-15)=72 \Leftrightarrow x \times 10=72 \Leftrightarrow x=72 \div 10=7,2$
$(x \times 9) \div 52=18 \Leftrightarrow x \times 9=18 \times 52=936 \Leftrightarrow x=936 \div 9=104$
$623 \times x-123 \times x =1000 \Leftrightarrow x \times (623-123)=1000 \Leftrightarrow x \times 500=1000 \Leftrightarrow x=1000 \div 500=2$
$236 \times x-36 \times x =2000 \Leftrightarrow x \times (236-36)=2000 \Leftrightarrow x \times 200=2000 \Leftrightarrow x=2000 \div 200=10$
$2125 \div x-125 \times x =100 \Leftrightarrow (2125-125) \div x=100 \Leftrightarrow 2000 \div x=100 \Leftrightarrow x=2000 \div 100=20$