Tính:
a, (48 + 13) × 4 - 279 ÷ 9
b, 832 - 816 ÷ 6 × (24 ÷ 8)
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24 : 8 = 3 16 : 8 = 2 32 : 8 = 4 | 56 : 8 = 7 8 : 8 = 1 72 : 8 = 9 | 40 : 8 = 5 64 : 8 = 8 48 : 8 = 6 |
a) 48 : 6 : 2 = 4
48 : 6 x 2 = 16
b) 27 : 9 x 3 = 9
27 : 9 : 3 = 1
a) 5 x 7 + 14
= 35 + 14
= 49
b) 48 : 6 + 13
= 8 +13
= 21
c) 6 x 8 – 26
= 48 – 26
= 22
d) 24 - 4 x 5
= 24 – 20
= 4
2. Tính (+5) + ( +4) = 9
3.Tính (- 9) + ( - 1) = -10
4.Tính : 28 + (-15) = 13
5.Tính (-15) + 12 = - 3
6.Tính (-25) + 25 = 0
7.Tính : 13 - 17 = - 4
8.Tính : (-78) - 9 = - 87
9.Tính : ( -24) - ( - 16) = - 8
10.Tính : 17 - (-3) = 20
11.Tính nhanh : (-21) - ( 48 + 52 - 21) = -100
2, (+5)+(+4)=+9 hoạc 9 cũng được
3, (-9)+(-1)=-10
4, 28+(-15)=13
5, (-15)+12=-3
6, (-25)+25=0
7, 13-17=4
8, (-78)-9=-87
9, (-24)-(-16)=-40
10, 17-(-3)=20
11, (-21+21)-(48-52)=-4
a) y - 6 chia 2 - ( 48 - 24 x 2 chia 6 - 3 ) = 0
=> y - 6 chia 2 - ( 48 - 48 chia 6 - 3 ) = 0
=> y - 6 chia 2 - ( 48 - 8 -3 ) = 0
= > y - 6 chia 2 - 37 = 0
=> y - 6 chia 2 = 0 + 37
=> y - 6 chia 2 = 37
=> y -6 = 37 chia 2
=> y - 6 = 37 / 2
=> y = 37 / 2 + 6
=> y = 49 / 2
Vậy y = 49 / 2
b) ( 7 x 13 + 8 x 13 ) chia ( 92 /3-y ) = 39
=> ( 91 + 104 ) chia ( 92/3 - y ) =39
=> 195 chia ( 92 /3 - y ) = 39
=> 92/3 - y = 7605
=> y = 7605 + 92/3
=> y = 22907 /3
Vậy y = 22907 / 3
8 × 4 = 32 32 : 8 = 4 32 : 4 = 8 | 8 × 7 = 56 56 : 8 = 7 56 : 7 = 8 | 8 × 6 = 48 48 : 8 = 6 48 : 6 = 8 |
\(\dfrac{7}{18}=\dfrac{7.4}{18.4}=\dfrac{28}{72}\); \(\dfrac{9}{8}=\dfrac{9.9}{8.9}=\dfrac{81}{72}\)
\(\dfrac{2}{3}=\dfrac{2.20}{3.20}=\dfrac{40}{60};\dfrac{3}{4}=\dfrac{3.15}{4.15}=\dfrac{45}{60};\dfrac{6}{5}=\dfrac{6.12}{5.12}=\dfrac{72}{60}\)
\(\dfrac{13}{12}=\dfrac{13.5}{12.5}=\dfrac{65}{60};\dfrac{5}{6}=\dfrac{5.10}{6.10}=\dfrac{50}{60};\dfrac{4}{5}=\dfrac{4.12}{12.5}=\dfrac{48}{60}\)
\(\dfrac{9}{8}=\dfrac{9.8}{8.6}=\dfrac{72}{48};\dfrac{7}{24}=\dfrac{7.2}{24.2}=\dfrac{14}{48};\dfrac{41}{48}\)
1) \(35.18-5.7.28=35.18-35.28=35\left(18-28\right)=-350\)
2) \(45-5\left(12+9\right)=45-60-45=-60\)
3) \(24\left(16-5\right)-16\left(24-5\right)=24.16-24.5-16.24+16.5=5\left(16-24\right)=5.8=40\)
4) \(29\left(19-13\right)-19\left(29-13\right)=29.19-29.13-19.29+19.13=13\left(19-29\right)=-130\)
5) \(31.\left(-18\right)+31.\left(-81\right)-31=-31.\left(18+81+1\right)=-3100\)
6) \(\left(-12\right).47+\left(-12\right).52+\left(-12\right)=\left(-12\right)\left(47+52+1\right)=-1200\)
7) \(13\left(23+22\right)-3\left(17+28\right)=13.45-3.45=45.\left(13-3\right)=450\)
8) \(-48+48.\left(-78\right)+48.\left(-21\right)=-48\left(1+78+21\right)=-4800\)