(-23)- 15- (-23) + 5+ (-10)
=-23-15+23+5-10
=(-23+23)+(-15+5-10)
=0-20
=-20
`(-23)-15-(-23)+5(-10)`
`=-23-15+23+5+(-10)`
`=[(-23)+23]-15+5+(-10)`
`=0-15+5+(-10)`
`=-15+5+(-10)`
`=-10+(-10)`
`=-20`
(-23)-[15+5+(-10)]
(-23)-[20+(-10)]
(-23)-10
= -33
(-23)- 15- (-23) + 5+ (-10)
=-23-15+23+5-10
=(-23+23)+(-15+5-10)
=0-20
=-20
`(-23)-15-(-23)+5(-10)`
`=-23-15+23+5+(-10)`
`=[(-23)+23]-15+5+(-10)`
`=0-15+5+(-10)`
`=-15+5+(-10)`
`=-10+(-10)`
`=-20`
(-23)-[15+5+(-10)]
(-23)-[20+(-10)]
(-23)-10
= -33
(-23)-15-(-23)+5+(-10)
7) -29.(85-47)-85.(47-29)
8) -15.(23-29)+23-(15-29)
9) -13.(55-29)+23.(15-29)
13)-10.(2+4)-5.(4-3)
1) -145.(13 - 57) + 57.(10 -145)
2) 17.(15 - 16) + 16.( 17- 20)
3) -38.(25 - 4) + 25.(-4 + 38 )
4) 23.(145 - 17) - 145.(23 - 6)
5) 24.(15 - 4) + 4.(24 - 15)
6) 199.(15 - 17) - 199.(-17 + 5)
7) -39.(5 - 99) + 99.(10 - 39)
Tính hợp lí
1) -145.(13 - 57) + 57.(10 -145)
2) 17.(15 - 16) + 16.( 17- 20)
3) -38.(25 - 4) + 25.(-4 + 38 )
4) 23.(145 - 17) - 145.(23 - 6)
5) 24.(15 - 4) + 4.(24 - 15)
6) 199.(15 - 17) - 199.(-17 + 5)
7) -39.(5 - 99) + 99.(10 - 39)
bài 1
a. 5/18 + 8/19 - 7/21 + ( -10/36 + 11/19 + 1/3) - 5/8
b.1/13 + ( -5/18 - 1/13 + 12/17 ) - ( 12/17 - 5/18 + 7/5 )
c.15/14 - (17/23 - 80/87 + 5/4)+(17/23 - 15/14 + 1/4 )
d.1/25 - 4/27 + ( -23/27 + -1/25 - 5/43 ) + 5/43 - 4/7
bài 2
a. x +1/3 = 3/4
b. x - 2/5 = 5/7
c. -x - 2/3 = -6/7
d. 4/7 - x = 1/3
e. x+ 5/2 = -3/2
f. x + 5/6 = -1/12
GIÚP MÌNH VỚI Ạ MÌNH CẢM ƠN TRƯỚC
a)15×17-15/15×16+10
b)23×29-10/23×28+13
c)75×8+25/75×82-50
d)53+153×156/153×157-100
Tính a,1/2+-3/4 b;2/5+-1/16+-9/5+-5/16 c,-2/13+8/15+10/20+15/13+-23/15 giải giúp m
56+(-32)-78+44-10
32+|-23|-57+(-23)
|-8|+|-4|-(-12)+5
126+(-20)+2004+(-106)
(-199)+(-200)+(-201)
(-4)-(-8)+(-15)+(-10)
|-13|-(-17)+(-20)-(-18)
16-(-3)+(-5)-7+12
e) (x + 12 ) . (x - 3) = 0
g) (-x + 5) . (3 - x) = 0
h) ( x - 1 ) . ( x -2 ) - ( -x -3 ) = 0
Bài 3 : tính hợp lý:
a) (15 + 37) + ( 52 - 37 - 17 )
b) ( 38 - 42 +14) - ( 23 - 21 +10)
c) - ( 21 - 32) ) - ( -12 +32 )
d) - ( 12 + 21 - 23) - ( 23 - 21 +10 )
e) ( 57 -752 ) - ( 605 - 53 )
g) ( 55 + 45 + 15) - (15 - 55 +45)