trang co 27-7 = 20 cai keo
ra 80000 do !!!!
cho xin 1 tk !!!
cho toi xin 1
tk nao !!!!!
= 800 x ( 23 + 77 )
= 800 x 100
=80000
tk nhe !!
800+23x800+77
=800x(23+77)
=800×100
=80000
2+8=10
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