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Tính nhanh:
a, 35x18 -5.7x28 = 35x18 -35x28 = 35 x (18 – 28) = 35 x ( -10) = -350
b,24x(16-5)-16x(24-5) = 24x16 – 24 x 5- 16x24 + 16x5 = (– 24 + 16)x 5 = -8 x 5 = -40
d,31x(-18)+31x(-81)-31 = 31x (-18 -81 – 1) = 31 x (-100) = -3100
e,(-12)x47+(-12)x52+(-12) = (-12)x (47+52 + 1)= (-12)x 100= - 1200
Ý c chưa rõ đề bài...
\(a.35\times18-5.7\times28\)
\(=35.18-35.28\)
\(=35.\left(18-28\right)\)
\(=35.\left(-10\right)\)
\(=-350\)
\(b.24.\left(16-5\right)-16.\left(24-5\right)\)
\(=24.16-24.5-16.24-16.5\)
\(=\left(24.16-16.24\right)-24.5-16.5\)
\(=0-\left(24+16\right).5\)
\(=0-40.5\)
\(=0-200\)
\(=-200\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`P = 24 . ( 31 + 14 ) - 31 . ( 24 - 14 )`
`P = 24 . 31 + 24 . 14 - 31 . 24 + 31 . 14`
`P = ( 24 . 31 - 31 . 24 ) + ( 24 . 14 + 31 . 14 )`
`P = 14 ( 24 + 31 )`
`P = 14 . 55 = 770`
![](https://rs.olm.vn/images/avt/0.png?1311)
1. 14-24-12
= -10 - 12
= -10 + (-12)
= -22
2. (-25)+30-15
= 5-15
= -10
3. 13-31
= -18
CHÚC BẠN HỌC GIỎI
1. 14-24-12
=14+(-24)+(-12)
=[14+(-24)]+(-12)
=-10+(-12)
=-22
2. (-25)+30-15
=(-25)+30+(-15)
=[(-25)+(-15)]+30
=-40+30=-10
3. 13+31=-18
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 78 . 31 + 78 . 24 + 78 . 17 + 22 . 17
= 78 . (31 + 24) + 17 . (78 + 22)
= 78 . 55 + 17 . 100
= 4290 + 1700
= 5990
b) 64 . 14 + 9 . 56
= 64 . 14 + 9 . 14 . 4
= 14 . (64 + 9 . 4)
= 14 . 100
= 1400
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (–37 ) + (–112)
= –(37 + 112) (cộng hai số nguyên âm).
= –149.
b) (–42) + 52
= 52 – 42 (cộng hai số nguyên khác dấu)
= 10
c) 13 – 31 = –31 + 13 = – (31 – 13) = –18.
d) 14 – 24 – 12 = 14 – (24 + 12) = 14 – 36 = – (36 – 14) = –22.
e) (–25) + 30 – 15 = 30 – 25 – 15 = 30 – (25 + 15) = 30 – 40 = –10
![](https://rs.olm.vn/images/avt/0.png?1311)
a)31.14+31.(2.43)
=31.14+31.86
=31(14+86)
=31.100
=3100
b)135.(-24)+135.(-75)-135.1
=135[(-24)+(-75)-1]
=135.(-100)
=-13500
a, 31 . 14 + 62 . 43
= 31.14 + 31.86
= 31.(14 + 86)
= 31.100
- 3100
b, -135 . 24 +135 . (-75) - 135
= -135.(24 + 75 + 1)
= -135.100
= -13500
![](https://rs.olm.vn/images/avt/0.png?1311)
b) 78.(31+24+17)+22.72
= 78.82+22.72
=78.10+72.(78+22)
=780+7200
=7980
k minh nha ninh dang can no gap
![](https://rs.olm.vn/images/avt/0.png?1311)
d=43/37d=43/37 × 23/15−43/3723/15−43/37 × 8/15+31/378/15+31/37
=43/37=43/37 x 23/15+43/3723/15+43/37 x (−8/15)+31/37(−8/15)+31/37
=43/37(23/15−8/15)+31/37=43/37(23/15−8/15)+31/37
=43/37.1+31/37=43/37.1+31/37
=2=2
E=−5/24E=−5/24 × 9/11−5/249/11−5/24 × 2/11+7/122/11+7/12
=−5/24(9/11+2/11)+7/12=−5/24(9/11+2/11)+7/12
=−5/24.1+7/12=−5/24.1+7/12
=3/8=3/8
a)3/7–−11/14−7/3×6/7a)3/7–−11/14−7/3×6/7
=3/7−−11/14−2=3/7−−11/14−2
=3/7+11/14−2=3/7+11/14−2
=−11/14=−11/14
b)6/5:3/2+−2/3×9/14b)6/5:3/2+−2/3×9/14
=4/5−3/7=4/5−3/7
=13/35
d=43/37d=43/37 × 23/15−43/3723/15−43/37 × 8/15+31/378/15+31/37
=43/37=43/37 x 23/15+43/3723/15+43/37 x (−8/15)+31/37(−8/15)+31/37
=43/37(23/15−8/15)+31/37=43/37(23/15−8/15)+31/37
=43/37.1+31/37=43/37.1+31/37
=2=2
E=−5/24E=−5/24 × 9/11−5/249/11−5/24 × 2/11+7/122/11+7/12
=−5/24(9/11+2/11)+7/12=−5/24(9/11+2/11)+7/12
=−5/24.1+7/12=−5/24.1+7/12
=3/8=3/8
a)3/7–−11/14−7/3×6/7a)3/7–−11/14−7/3×6/7
=3/7−−11/14−2=3/7−−11/14−2
=3/7+11/14−2=3/7+11/14−2
=−11/14=−11/14
b)6/5:3/2+−2/3×9/14b)6/5:3/2+−2/3×9/14
=4/5−3/7=4/5−3/7
=13/35
Sửa đề : \(24x\left(31+14\right)=31x\left(24-14\right)\)
\(24x.45=31x.10\)
\(1080x=310x\)
\(1080x-310=0\)
\(770x=0\)
\(x=0\)
bạn ơi đó là nhân hay là biến ạ ?
bạn đó làm là biến rồi nên mk sửa đó là nhân nhé :))
\(24.\left(31+14\right)-31.\left(24-14\right)\)
\(=24.31+24.14-31.24+31.14\)
\(=24.\left(31+14-31\right)+31.14\)
\(=24.14+31.14=14.\left(24+31\right)=14.55=770\)