2/9x8
5+9x8-2+7x25=?
đáp số: 248
ai k mk mk sẽ k lại ủng hộ mk nha ^_^
7/9x7/24+2/9x7/24=
12/9x8/35-3/9x8/35=
17/25x13/19+17/25x6/19=
47/19:15/32-47/19:15/17=
Cách giải nữa nha các bạn!!!!!
Câu 11 : TÍNH NHANH
4x126x25
(9x8-12-5x12) x (1+2+3+4+5)
\(4\times126\times25\\ =\left(4\times25\right)\times126\\ =100\times126\\ =12600\)
\(\left(9\times8-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(72-12-60\right)\times15\\ =\left(60-60\right)\times15\\ =0\times15\\ =0\)
\(4\times126\times25=\left(4\times25\right)\times126=100\times126=12600\\ \left(9\times8-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(3\times3\times2\times4-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(12\times6-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left[12\times\left(6-1-5\right)\right]\times\left(1+2+3+4+5\right)\\ =\left(12\times0\right)\times\left(1+2+3+4+5\right)\\ =0\times\left(1+2+3+4+5\right)=0\)
Tính nhanh
( 9x8-12-5x12) x ( 1+2+3+4+5)
(9x8-12-12x5)x(1+2+3+4+5)
= (72-12-60)x(1+2+3+4+5)
= 0x(1+2+3+4+5)
=0
( 9 x 8 - 12 - 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )
= ( 3 x 3 x 4 x 2 - 12 - 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )
= ( 6 x 12 - 12 - 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )
= { 12 x ( 6 - 5 - 1 ) } x ( 1 + 2 + 3 + 4 + 5 )
= 12 x 0 x ( 1 + 2 + 3 + 4 + 5 )
= 0
k cho mình nha chúc bạn học tốt
Trả lời :.............................................
( 9 x 8 - 12 - 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )
= 72 - 12 - 60 x 15
= 0 - 900
= 900
Hk tốt..........................................
k nhé Ter Stegen
=
(a - 19.99) : 2 = 1x1+1x2+1x3+1x4+...+9x7+9x8+9x9
Tìm a
(a - 19.99) : 2 = 1 x 1 + 1 x 2 + 1 x 3 + 1 x 4 +...+ 9 x 7 + 9 x 8 + 9 x 9
(a - 19.99) : 2 = 1 x (1 + 2 + 3 + 4 + 5 + 6 + 7 )
Á Xl, mình ấn nhầm nhé '-' Câu trl k đúng đâu !!
xong chưa????????????????
9x8=
9+9x8
9+9x8=81 k mình nhé mình k cho bạn rui đấy
9+9+9x8=...
9 + 9 + 9 * 8 = 9 + 9 + 72 = 18 + 72 = 90
k nhé
100-10+9x8:5x10-8=
\(100-10+9\times8:5\times10-8\)
\(=90+9\times\dfrac{8}{5}\times10-8\)
\(=82+\dfrac{9\times8\times10}{5}\)
\(=82+9\times8\times2\)
\(=82+144\)
\(=226\)
100- 10+ 9x8:5x 10- 8
=100- 10+ 72: 5x10-8
=100- 10+ 14,4x10 -8
= 100-10 + 144 -8
=90 + 144 -8
= 234 - 8
=226