13-18-(-42)-15 Giúp mik vs
bài 3: Tính:
1) 1/6 - -5/6 2) 6/13 - -14/39 3) 4/5 - 4/-18 4) 7/21 - 9/-36
5) -12/18 - -21/35 6) -3/21 - 6/42 7) -18/24 - 15/21 8) 1/6 - 2/5
các bn giup mik mik vs
1)1/6 - - 5/6 = 1/6 + 5/6 = 1
2)6/13 - -14/39 = 6/13 + 14/39= 32/39
3)4/5 - 4/-18 = 4/5 + 4/18= 46/45
4)7/21 - 9/-36 = 7/21 + 9/36 = 7/12
5)-12/18 - -21/35 = -12/18 + 21/35 = -1/15
6)-3/21 - 6/42 = -2/7
7)-18/24 - 15/21 = -41/28
8)1/6 - 2/5 =-7/30
tính nhanh : 42*13-22*5+42*7-15*22
giúp mik :(
\(42.13-22.5+42.7-15.22\)
\(=42.\left(13+7\right)-22.\left(5+16\right)\)
\(=\left(42-22\right).20\)
\(=20.20\)
\(=400\)
Tính:
-15-(+9)
4-(-7)
-12+(-13)
-(-13)-(-10)
-4-(+7)
(-9)-(-13)
-(-12)+0
0-(+7)
0-(-3)
15-17
-18+12
-5-18
-(-15)+(-15)
Giúp e vs ạ
...=-15-9=-24
...=4+7=11
...=-12-13=-25
...=13+10=23
...=-4-7=-11
...=-9+13=4
...=12+0=12
...=0-7=-7
...=0+3=3
...=15-17=-2
...=-6
...=-23
...=15-15=0
-15-(+9) = -24
4-(-7) = 11
-12+(-13) = -25
-(-13)-(-10) = 23
-4-(+7) = -11
(-9)-(-13) = 4
-(-12)+0 = 12
0-(+7) = -7
0-(-3) = 3
15-17 = -2
-18+12 = -6
-5-18 = -23
-(-15)+(-15) = 0
tính nhanh
3) 14.35.5+10.25.7+20.7
4) 15(27+18+6)+ 15(23.12)
5) 24(15+49)+12(50+42)
6) 10(81+19)+100+50(91+9)
7) 53(51+4)+53(49+96)+53
8)42(15+96)+6(25+4).7
9) 45(13+78)+9(87+22).5
10) 16(27+75)+8(53+25).2
giúp mik nhé các bạn mong các bạn giúp đỡ
5) 24*(15+49)+12*(50+42)
=24*64+12*92
=24*64+12*2*46
=24*64+24*46
=24*(64+46)
=24*110
=2640
7) 53*( 51+4)+53*(49+96)+53
=53*55+53*145+53
=53*(55+145)+53
=53*200+53
10600+53
=10653
- ( - x + 13 - 142 ) + 18 = 55
giúp mik vs T-T
`-(-x+13-142) +18=55`
`=> x - 13 +142=55-18`
`=> x - 13 +142=37`
`=> x-13=37-142`
`=>x-13=-105`
`=>x=-105+13`
`=>x=-92`
- (- \(x\) + 13 - 142 ) + 18 = 55
\(x\) - 13 + 142 + 18 = 55
\(x\) = 55 - 18 - 142 + 13
\(x\) = (55 + 13) - (18 + 142)
\(x\) = 68 - 160
\(x\) = - 92
\(\dfrac{4,29x1230-429x2,3}{30-15+36-18+42-21+....+96-48+102-51}\)
Tính giúp mik nhé
Giải gấp vs ak
a, 13-18-(-42) -15 b,369-4 [ (-5) +4 . (-8)
c,(-8)3 : (-8)2 +8 d, (-12). (-13) + 13. (-29)
giài gấp vs bài tập Tết. Thanh kiu caccau đã giúp>
a) \(13-18-\left(-42\right)-15\)
\(=13-18+42-15\)
\(=\left(13-18-15\right)+42\)
\(=-20+42\)
\(=22\)
b) \(369-4.\left[-5+4.\left(-8\right)\right]\)
\(=369-4.\left[-5+\left(-32\right)\right]\)
\(=369-4.\left(-37\right)\)
\(=369+148\)
\(=517\)
c) \(\left(-8\right)^3\div\left(-8\right)^2+8\)
\(=-8+8\)
\(=0\)
d) \(\left(-12\right).\left(-13\right)+13.\left(-29\right)\)
\(=12.13+13.\left(-29\right)\)
\(=13.\left(-29+12\right)\)
\(=13.\left(-17\right)\)
\(=-221\)
Cho A=3/22+8/32+15/42+....+20232-1/20232 Không là số tự nhiên (lm nhanh giúp mik vs ạ )
13-18-(-42)-15=
\(13-18-\left(-42\right)-15\\ =13-18+42-15\\ =-5+42-15\\ =37-15=22\)