`#PhuonggYaa`
`10,2×20−5,1×10+5,1×90`
`=5,1×2×20−5,1×10+5,1×90`
`=5,1×(2×20−10+90)`
`=5,1×(40−10+90)`
`=5,1×120=612`
= 5,1 x 40 - 5,1 x 10 + 5,1 x 90
= 5,1 x (40 - 10 + 90)
= 5,1 x 120
= 612
10,2×20−5,1×10+5,1×9010,2×20−5,1×10+5,1×90
=5,1×2×20−5,1×10+5,1×90=5,1×2×20−5,1×10+5,1×90
=5,1×(2×20−10+90)=5,1×(2×20−10+90)
=5,1×(40−10+90)=5,1×(40−10+90)
=5,1×120=612