28+62.a.(a.1-a:1)+28.8+28=28.10+62.a.(a-a)=280+62.a.0=280
=28+62xax(a-a)+28x8+28
=28x(1+8+1)+ 62xax0=28x10+0=280
trả lời
28+62.a(a.1-a:1)+28.8+28
=28.10+62.a.(a-a)
=280+62.a.0
=280
chúc bn hc tốt
28 + 62 . a . ( a . 1 - a : 1 ) + 28 . 8 + 28
= 28 + 62 . a . ( a - a ) + 224 + 28
= 28 + 62 . a . 0 + 224 + 28
= 28 + 0 + 224 + 28
= 280
28+62x a x(a x1 -a:1)+28x8+28
28+26 xa a x(a-a)+28x8+28x1
=28x1+26x a x 0+28x8+28x1
=28x1+0x28+8+28x1
=28x(1+8+1)
=28x10
=280
28 + 62 x a x (a x 1 - a:1 ) + 28 x 8 +28
= 28.10+62.a(a-a)
= 280 +62.a.0
= 280
28 + 62 x a x ( a x 1 - a : 1) +28 x8+28 = 28 + 62 x a x ( a - a ) +28 x 8 + 28 x 1
= 28 + 62 x a x 0 + 28 x ( 8 + 1 )
= 28 + 0 + 28 x 9
= 28+252
= 280
CHÚC BẠN HỌC TỐT ^:^
28 + 62 x a x ( a x 1 - a :1) +28 x 8 + 28
28 + 62 x a x ( a - a ) + 28 x 8 + 28 x 1
= 28 x 1 + 62 x a x 0 + 28 x 8 + 28 x 1
= 28 x 1 + 0 + 28 x 8 + 28 x 1
= 28 x ( 1 + 8 + 1 )
= 28 x 10
= 280