|-23|+(-36)+(-13)
13+23-36=?
tính hợp lí nhất :
1, 35 . ( 14 - 23 ) - 23 . ( 14 - 35 )
2 , 27 . ( 13 - 16 ) - 16 .( 13 - 27 )
3, 44 . (-36 ) + 22 . ( - 28 )
1.
\(35\times\left(14-23\right)-23\times\left(14-35\right)\)
\(=35\times14-35\times23-23\times14+23\times35\)
\(=\left(23\times35-35\times23\right)+14\times\left(35-23\right)\)
\(=0+14\times12\)
\(=168\)
2.
\(27\times\left(13-16\right)-16\times\left(13-27\right)\)
\(=27\times13-27\times16-16\times13+16\times27\)
\(=13\times\left(27-16\right)+\left(27\times16-16\times27\right)\)
\(=13\times11+0\)
\(=143\)
3.
\(44\times\left(-36\right)+22\times\left(-28\right)\)
\(=22\times2\times\left(-36\right)+22\times\left(-28\right)\)
\(=22\times\left(-72\right)+22\times\left(-28\right)\)
\(=22\times\left[\left(-72\right)+\left(-28\right)\right]\)
\(=22\times\left(-100\right)\)
\(=-2200\)
Chúc bạn học tốt
(32/46*x-16/23*21/23>:<12/25+5/8*13/6-36/45:3)=0
( 32/46 x Y - 16/23 x 21/23) : ( 12/25 + 5/8 x 13/6 - 36/45 : 3 ) = 0
tim Y
bai nay bai lop 5 co phai hong chi
Tính rồi rút gọn
a , 5 6 + 3 6 = b , 8 12 - 1 3 = c , 15 × 3 5 = d , 6 5 : 2 3 =
>; <; = ?
a) \(\dfrac{21}{23}\) ? \(\dfrac{19}{23}\) \(\dfrac{8}{5}\) ? \(\dfrac{49}{30}\) \(\dfrac{20}{36}\) ? \(\dfrac{5}{9}\)
b) \(\dfrac{11}{15}\) ? \(\dfrac{11}{17}\) \(\dfrac{26}{13}\) ? 2 3 ? \(\dfrac{16}{5}\)
c) \(\dfrac{8}{9}\) ? 1 1 ? \(\dfrac{31}{27}\) \(\dfrac{8}{9}\) ? \(\dfrac{31}{27}\)
a) \(\dfrac{21}{23}>\dfrac{19}{23}\)
\(\dfrac{8}{5}=\dfrac{49}{30}\)
\(\dfrac{23}{36}>\dfrac{5}{9}\)
b) \(\dfrac{11}{15}>\dfrac{11}{17}\)
\(\dfrac{26}{13}=2\)
\(3< \dfrac{16}{5}\)
c) \(\dfrac{8}{9}< 1\)
\(1< \dfrac{31}{27}\)
\(\dfrac{8}{9}< \dfrac{31}{27}\)
Bài 1: Tính
a/ 25 + (-13) = -12 b/ (-17) + (-23) = ………… c/ (-29) + 36 = ……………..
d/ 45 + (-57) = ……….... e/ 105 + (-5) = ………… f/ (-48) + (-14) = ……………..
g/ (-75) + (-13) = ……….... h/ (-37) + 23 = ………… i/ (-54) + (-46) = ……………..
Bài 2: Tính
a/ 25.(-5) = ……….... b/ (-15).(-5) = 75 c/ 25.(-4) = ……………..
d/ (-4).(-8) = ……….... e/ (-15).7 = ………… f/ (-62).3 = ……………..
g/ (-75).(-2) = ……….... h/ 23.(-5) = ………… i/ (-42).(-5) = ……………..
Bài 3: Tìm ước của các số sau: 12; 18; -20; -24
Bài 4 tính nhanh
a/25.(-47).(-4) b/(-125).49.8 c/ 50.(-41).(-2)
d/ 37.(-54) + 37.(-46) e/ (-15).51 + (-15).49 f/ (-62).35 + 52.35
g/ 29.(-127) + 29.17 + 29.10 h/ 47.(-18) + 47.(-32) + 47.(-50) i/ 53.(-17) + (-53).83
.Bài 5: Tìm x, biết
a/ 5x – 12 = -22 b/ 17 + 2x = 7 c/ 2x + 15 = -25 d/ 33 – 4x = 53
e/ 5(x + 2) – 11 = -31 f/ 23 + 2(17 – x) = 33 g/ 21 – 5(x + 1) = 41 h/ 33 – 4x = 53
Bài 1:
b) (-17)+(-23)=-40
c) (-29)+36=7
d) 45+(-57)=-12
e) 105+(-5)=100
f) (-48)+(-14)=-62
g) (-75)+(-13)=-88
h) (-37)+23=-14
i) (-54)+(-46)=-100
Bo dau ngoac roi rut gon bieu thuc :
a) - ( - 12 + 25 - 36 ) - ( 12 - 36 + 57 )
b) - ( 23 + 5 - 6 + 17 ) + ( 23 - 5 - 83 - 6 )
c) 12 . ( 6 - 7 - 8 ) - 10 . ( 11 + 12 - 13 )
Giup minh voi minh dang can rat gap
a. = 12 - 25 + 36 - 12 + 36 - 57
= (12 - 12) + (36 + 36) - (25 + 57)
= 0 + 72 - 82
= -10
b. = -23 - 5 + 6 - 17 + 23 - 5 - 83 - 6
= (-23 + 23) + (-5 - 5) + (6 - 6) - (17 + 83)
= 0 + (-10) + 0 - 100
= -110
c.?
bài 1:tính
a) 21+22+23+24-11-12-13-14
b) 34+35+36+37-14-15-16-17
c) 55+56+57+58-35-36-37-38
mik cần câu trả lời đúng nhất ❗
a: =(21-11)+(22-12)+(23-13)+(24-14)
=10+10+10+10
=40
b: =(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20
=80
a, =(21-11)+(22-12)+(23-13)+(24-14)
=10+10+10+10
=40
b. =(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20
=80
c,55+56+57+58-35-36-37-38
=111+57+58-35-36-37-38
=168+58-35-36-37-38
=226-35-36-37-38
=191-36-37-38
=155-37-38
=118-38
=80