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a) 6,3 + (-3,7) + 2,4 + (-0,3)

= (6,3 + 2,4) + [-3,7 + (-0,3)]

= 8,7 + (-4)

=  4,7

b) (-4,9) + 5,5 + 4,9 + (-5,5)

= (-4,9 + 4,9) + [5,5 + (-5,5)]

= 0 + 0

= 0

c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2

= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7

= 0 + 0 + 3,7

= 3,7

d) (-6,5) . 2,8 + 2,8 . (-3,5)

= 2,8 . [-6,5 + (-3,5)]

= 2,8 . (-10)

= -28.

a, \(6,3+\left(-3,7\right)+2,4+\left(-0,3\right)\)

\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)

\(=6-1,3=4,7\)

b, \(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)

\(=\left(-4,9+4,9\right)+\left(5,5-5,5\right)\)

\(=0+0=0\)

Chúc bạn học tốt!!!

a, 6.3+(-3.7)+2.4+(-0.3) = (6,3 - 0,3) + (-3,7+2,4) = 6 - 1,3 = 4,7

b, (-4.9)+5.5+4.9+(-5.5) = (-4,9 +4,9) + (-5,5 + 5,5) = 0 + 0 = 0

a)\(6,3+\left(-3,7\right)+2,4+\left(-0,3\right)\)

\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)

\(=6+\left(-1,3\right)=4,7\)

b)\(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)

\(=\left(-4,9+4,9\right)+\left(-5,5+5,5\right)\)

\(=0+0=0\)

Xét \(\Delta ANB \) và \(\Delta BMA\) có:

AN=BM (gt)

\(\widehat {BAN} = \widehat {ABM}\) (gt)

AB chung

=>\(\Delta ANB = \Delta BMA\)(c.g.c)

=> \(\widehat{ABN} = \widehat{BAM}\) (2 góc tương ứng)

Đặt P= \(\dfrac{2.5^{22}-9.5^{21}}{25^{10}}\) : \(\dfrac{5.\left(3.7^{15}-19.7^{14}\right)}{\left(7^{16}+3.7^{15}\right)}\)

Có : \(\dfrac{2.5^{22}-9.5^{21}}{25^{10}}\)

= \(\dfrac{\left(2.5-9\right).5^{21}}{\left(5^2\right)^{10}}\)= \(\dfrac{\left(10-9\right).5^{21}}{5^{20}}\)=\(\dfrac{5^{21}}{5^{20}}\)= 5 (1)

Có: \(\dfrac{5.\left(3.7^{15}-19.7^{14}\right)}{\left(7^{16}+3.7^{15}\right)}\)

= \(\dfrac{5.\left[7^{14}.\left(3.7-19\right)\right]}{\left[7^{15}.\left(3+7\right)\right]}\)=\(\dfrac{5.7^{14}.2}{7^{15}.10}\)=\(\dfrac{10.7^{14}}{7^{15}.10}\)=\(\dfrac{1}{7}\) (2)

Từ (1) và (2) suy ra:

A= 5:\(\dfrac{1}{7}\)=5.7=35

Vậy A=35 hay \(\dfrac{2.5^{22}-9.5^{21}}{25^{10}}\):\(\dfrac{5.\left(3.7^{15}-19.7^{14}\right)}{\left(7^{16}+3.7^{15}\right)}\)= 35

\(P=\dfrac{2.5^{22}-9.5^{20}}{25^{10}}:\dfrac{5\left(3.7^{15}-19.7^{14}\right)}{7^{16}+3.7^{15}}\)

\(=\dfrac{5^{20}\left(2.5^2-9\right)}{5^{20}}:\dfrac{5.7^{14}\left(3.7-19\right)}{7^{15}\left(7+3\right)}\)

\(=\left(2.5^2-9\right):\dfrac{5\left(3.7-19\right)}{7.10}\)

\(=\dfrac{7.10\left(2.5^2-9\right)}{5\left(3.7-19\right)}\)

\(=\dfrac{7.2\left(2.5^2-9\right)}{3.7-19}\)

\(=\dfrac{14.41}{21-19}\)

\(=\dfrac{14}{2}\cdot41=7.41=287\)

Dấu \("."\) là dấu nhân 

\(0,7.y+\frac{3}{10}.y=6,3\)

\(\Rightarrow0,7.y+0,3.y=6,3\)

\(\Rightarrow\left(0,7+0,3\right).y=6,3\)

\(\Rightarrow1.y=6,3\)

\(\Rightarrow y=6,3:1\)

\(\Rightarrow y=6,3\)

Vậy \(y=6,3\)

Chúc bạn học tốt !!! 

0,7 * y + 3/10 * y = 6,3

0,7 * y + 0,3 * y = 6,3

y * [0,7+0,3] =6,3

y * 1 =6,3

      y = 6,3 :1

       y=6,3

0,7 x y + \(\frac{3}{10}\)x y = 6,3

( 0, 7 + \(\frac{3}{10}\)) x y = 6,3

          1             x y = 6,3

 0.7*y+3/10*y=6.3

(0.7+3/10)*y=6.3

1*y=6.3

y=6.3:1

y=6.3

Vậy y=6.3