407,8 x 99 - 407,8 + 2 x 407,8
=407,8 x 99 - 407,8 +2 x 407,8 x1
=407,8x(99+2-1)
=407,8x100
=40680
40780 đó bạn nha
\(407,8 × 99-407,8 + 2×407,8\)
\(= 407,8×( 99 - 1 + 2 ) \)
\(= 407, 8 × 100\)
\(= 40780\)
\(\text{407,8 x 99 - 407,8 + 2 x 407,8x1}\)
\(\text{=407,8x(99+2-1) }\)
\(\text{=407,8x100}\)
\(=40780\)
tính nhanh
407,8 x 99 - 407,8 + 2 x 407,8
= 407,8 x 99 + 2 ) - 1
= 407,8 x 101 -1
= 407,8 x 100
= 40780
h nhieu v nha
\(407,8\times99-407,8+2\times407,8\)
\(=407,8\times\left(99-1+2\right)\)
\(=407,8\times100\)
\(=40780\)