( 5 - 8 - 15 ) - 3.(-5+9) 

= 5 - 8 - 15 + 15 - 27 

= 5 - 8 - 27 

= -30 

(5-8-15)-3.(-5+9)

= ( -18) - 3(-5 +9 )

= (-18) - 3 . 4

= -18 - 12

= -30

Học tốt nhé 

(5-8-15)-3.(-5+9)

=5-8-15-3.(-5+9)

=-3-15-3.14

=-3+(-5)-42

=-8-42

=-8+(-42)

=-50

1.(-8)-[(-5)+8]=-8+5-8=-11

học tốt:)

1.(-8)-[(-5)+8]

=1.(-8)-3

=-8-3

=-11

-8 + 5 -8 bằng -11

kết bạn vs mk ik mọi ng 

cùng nhau học tập nào

a)  x + 8 - (x+22) = x + 8 - x - 22 = ( x - x ) + ( 8 - 22 ) = 0 + -14 = -14

b) -(x + 5) + (x+10) - 5 = -x + -5 + x + 10 - 5 = (-x+x) + (-5 + 10 -5) = 0 + (5 - 5) = 0 + 0 = 0

Nhấn đúng cho mình nha!!!!!!!!!!!!!!

a, x+8-(x+22)

=x+8-x-22=(x-x)+(8-22)=-14

b,   -(x+5)+(x+10)-5

=-x+(-5)+x+10-5

=(-x+x)=(-5+10-5)

=0

7.(10-3)-8.(2-9)

=7.10-3-8.2-9

=70-3-8.2-9

=70-3-16-9

=70-(3+16+9)

=70-28

=42

CHÚC BẠN HỌC TỐT!

Trả lời:

\(7\times\left(10-3\right)-8\times\left(2-9\right)\)

\(=7\times10-7\times3-8\times2+8\times9\)

\(=70-21-16+72\)

\(=49+56\)

\(=105\)

7.(10-3)-8.(2-9)

7.7-8.-7

49-(-56)

105

-12+8-9-5+12+7-4=-3

(-12+8-9)-(5-12-7)-|4|

=-12+8-9-5+12+7-4

=8+7-9-5-4=-3

\(\begin{array}{l}a)\frac{9}{{10}} - (\frac{6}{5} - \frac{7}{4})\\ = \frac{9}{{10}} - \frac{6}{5} + \frac{7}{4}\\ = \frac{{18}}{{20}} - \frac{{24}}{{20}} + \frac{{35}}{{20}}\\ = \frac{{18 - 24 + 35}}{{20}}\\ = \frac{{29}}{{20}}\\b)6,5 + [0,75 - (8,25 - 1,75)]\\ = 6,5 + (0,75 - 8,25 + 1,75)\\ = 6,5 + 0,75 - 8,25 + 1,75\\ = 7,25 - 8,25 + 1,75\\ = ( - 1) + 1,75\\ = 0,75\end{array}\)

\(\begin{array}{l}a)\frac{{17}}{{11}} - \left( {\frac{6}{5} - \frac{{16}}{{11}}} \right) + \frac{{26}}{5}\\ = \frac{{17}}{{11}} - \frac{6}{5} + \frac{{16}}{{11}} + \frac{{26}}{5}\\ = (\frac{{17}}{{11}} + \frac{{16}}{{11}}) + (\frac{{26}}{5} - \frac{6}{5})\\ = \frac{{33}}{{11}} + \frac{{20}}{5}\\ = 3 + 4\\ = 7\\b)\frac{{39}}{5} + \left( {\frac{9}{4} - \frac{9}{5}} \right) - \left( {\frac{5}{4} + \frac{6}{7}} \right)\\ = \frac{{39}}{5} + \frac{9}{4} - \frac{9}{5} - \frac{5}{4} - \frac{6}{7}\\ = (\frac{{39}}{5} - \frac{9}{5}) + (\frac{9}{4} - \frac{5}{4}) - \frac{6}{7}\\ = \frac{{30}}{5} + \frac{4}{4} - \frac{6}{7}\\ = 6 + 1 - \frac{6}{7}\\ = 7 - \frac{6}{7}\\ = \frac{{49}}{7} - \frac{6}{7}\\ = \frac{{43}}{7}\end{array}\)

a) (27+514)-(486-73)

=27+514-486+73

=541-486+73

=55+73

=128

b) (36+79)+(145-79-36)

=36+79+145-79-36

=115+145-79-36

=260-79-36

=181-36

=145

c) 10-[12-(-9-1)]

=10-12+(-9)+(-1)

=(-2)+(-9)+(-1)

=(-11)+(-1)

=-12

tick nha bạn

5)27+514-486+73

6)36+79+145-79-36

7)10-12-9-1

(27+514)-(486-73)

=27+514-486+73

=(27+73)-(486+514)

=100-1000

=(-10)