A
Tính nhanh:A.56x12+24x36+24x36
b.2005x178➖ 77x2005➖ 2005
tính nhanh :
56x12+24x36+24x36
56x12+24x36+24x36
=28x(2x12)+24x36+24x36
=28x24+24x36+24x36
=24x(28+36+36)
=24x100
=2400
56 x 12 + 24 x 36 + 24 x 36
= 28 x (2x12)+24x36+24x36
= 28x24+24x36+24x36
= 24x (28+36+36)
= 24x100
= 2400
Thijjck nhak!!
Rút gọn biểu thức sau khi bỏ ngoặc
a ➕b➖(b➖a➕c)
a + b - (b - a + c)
= a + b - b + a - c
= (a + a) + (b - b) - c
= 2a - c
tính nhanh
a) 2/300+6/300+10/300+...+202/300+206/300
b) 24x36+24x64/12x135-12x35
A = \(\dfrac{2}{300}\) + \(\dfrac{6}{300}\) + \(\dfrac{10}{300}\)+.....+ \(\dfrac{202}{300}\) + \(\dfrac{206}{300}\)
A = \(\dfrac{1}{300}\)\(\times\) ( 2 + 6 + 10 +.....+ 202 + 206)
A = \(\dfrac{1}{300}\) \(\times\) ( 206 +2) \(\times\) { ( 206 - 2) : 4 + 1} : 2
A = \(\dfrac{1}{300}\) x 208 x 52 : 2
A = \(\dfrac{1352}{75}\)
B = \(\dfrac{24\times36+24\times64}{12\times135-12\times35}\)
B = \(\dfrac{24\times(36+64)}{12\times(135-35)}\)
B = \(\dfrac{24\times100}{12\times100}\)
B = 2
1➕(-2)➕(-3)➕4➕5➕(-6)➕(-7)➕8➕........➕99➖100➖101➖102➖103 cứu mk vs các sensei kawaiii
phân tích đa thức thành nhân tử :
x mũ 2➕4➖y mũ 2➖4x
tham khảo
x mũ 2➕4➖y mũ 2➖4x
=(x2+4x+4)-y2
=(x+2)2-y2
=(x+2+y)(x+2-y)
4/3x9/8x16/15x25/24x36/35x49/48x64/63x81/80x100/99x121/120
A = \(\dfrac{4}{3}\times\dfrac{9}{8}\times\dfrac{16}{15}\times\dfrac{25}{24}\times\dfrac{36}{35}\times\dfrac{49}{48}\times\dfrac{64}{63}\times\dfrac{81}{80}\times\dfrac{100}{99}\times\dfrac{121}{120}\)
A = \(\dfrac{2\times2\times3\times3\times4\times4\times5\times5\times6\times6\times7\times7\times8\times8\times9\times9\times10\times10\times11\times11}{1\times3\times2\times4\times3\times5\times4\times6\times5\times7\times6\times8\times7\times9\times8\times10\times9\times11\times10\times12}\)
A = \(\dfrac{3\times3\times4\times4\times5\times5.....\times10\times10}{3\times3\times4\times4\times5\times5.....\times10\times10}\) \(\times\) \(\dfrac{2\times2\times11\times11}{1\times2\times11\times12}\)
A =1 \(\times\) \(\dfrac{2\times2\times11\times11}{1\times2\times11\times2\times6}\)
A = \(\dfrac{2\times2\times11}{2\times2\times11}\) \(\times\) \(\dfrac{11}{6}\)
A = 1 \(\times\) \(\dfrac{11}{6}\)
A = \(\dfrac{11}{6}\)
9/8x16/15x25/24x36/35x49/48x64/63x81/80=?
cac bạn giúp mik với
\(\frac{9}{8}\)x \(\frac{16}{15}\)x \(\frac{25}{24}\)x \(\frac{36}{35}\)x\(\frac{49}{48}\)x\(\frac{64}{63}\)x\(\frac{81}{80}\)
= \(\frac{3x3}{2x4}\)x \(\frac{4x4}{3x5}\)x\(\frac{5x5}{4x6}\)x\(\frac{6x6}{5x7}\)x\(\frac{7x7}{6x8}\)x\(\frac{8x8}{7x9}\)x\(\frac{9x9}{8x10}\)
= \(\frac{3x3x4x4x5x5x6x6x7x7x8x8x9x9}{2x4x3x5x4x6x5x7x6x8x7x9x8x10}\)
= \(\frac{3x9}{2x10}\)
= \(\frac{27}{20}\)
a)57phút18 giây ➗ 9 ➖45phút27 giây ➗ 9 b)2giờ12phút ✖️ 4 ➕ 5giờ48phút✖️4 Giúp mình vs ạ
5 ➖x bằng 1 phần 3
5 - X = \(\frac{1}{3}\)
X = \(5-\frac{1}{3}\)
X= \(\frac{14}{3}\)