165 . 23 – 218 .5 – 86 . 7
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Lời giải chi tiết:
28 < 31 | 84 < 90 | 54 < 50 + 5 |
65 > 64 | 72 = 72 | 25 = 20 + 5 |
23 < 32 | 48 > 39 | 86 < 80 + 7 |
28 < 31 | 84 < 90 | 54 < 50 + 5 |
65 > 64 | 72 = 72 | 25 = 20 + 5 |
23 < 32 | 48 > 39 | 86 < 80 + 7 |
Tính nhanh:
a) 36.(65-79)+65|35-79|
=36.(-14) + 65.44
=-504 + 2860
=2356
b) 12.(34-86)+34.(86-12)+86.(12-34)-12.(34+86)
= 12.(-52) +34.74+86. (-22) - 12.120
=-624 + 2516 +(-1892) -1440
= 1892 + (-1892) -1440
=0- 1440
=-1440
\(\left(-67\right)+125+\left(-33\right)+75\)
\(=\left[\left(-67\right)+\left(-33\right)\right]+\left(125+75\right)\)
\(=100+200=300\)
_______
\(86.\left(-108\right)+86.9-86\)
\(=86.\left[\left(-108\right)+9-1\right]\)
\(=86.\left(-100\right)=-8600\)
_______
\(23.\left(-16\right)-23.84+300\)
\(=23.\left[\left(-16\right)-84\right]+300\)
\(=23.\left(-100\right)+300\)
\(=-2300+300\)
\(=-2000\)
______
\(235-5\left[\left(5^3-3^3\right):14\right]\)
\(=235-5\left[\left(125-27\right):14\right]\)
\(=235-5\left[98:14\right]\)
\(=235-5.7\)
\(=235-35\)
\(=200\)
_______
\(95-\left(129-74\right):5+2022^0\)
\(=95-55:5+1\)
\(=95-11+1\)
\(=84+1=85\)
\(#NqHahh\)
a,x+7=19-1
x+7=18
x =18-7
x =11.
b,x+6=48-19
x+6 =29
x =29-6
x =23.
c,x+34=23+22
x+34 =45
x =45-34
x =11.
d,x+23=86-15
x+23 =71
x =71-23
x =48.
y+7=19-1
y+7=18
y=18-7
y=11
x+6=48-19
x+6=29
x=29-6
x=23
y+34=23+22
y+34=55
y=55-34
y=21
x+23=86-15
x+23=71
x=71-23
x=48
bạn ơi k cho mình với
1. 36 x 25 x 4
= 36 x 100
= 3600
2. 18 x 24 : 9
= 18 : 9 x 24
= 2 x 24
= 48
3. 41 x 2 x 8 x 5
= 41 x 8 x 10
= 328 x 10
= 3280
4. 108 x (23+7)
= 108 x 30
= 3240
5. 215 x 86 + 215 x 14
= 215 x (86+14)
= 215 x 100
= 21500
6. 53 x 128 - 43 x 128
= (53-43) x 128
= 10 x 128
= 1280
\(\dfrac{9}{5}=\dfrac{18}{10}=1,8\)
\(\dfrac{2}{25}=\dfrac{8}{100}=0,08\)
\(\dfrac{23}{8}=\dfrac{2875}{1000}=2,875\)
\(\dfrac{76}{4}=\dfrac{1900}{100}=19\)
\(\dfrac{42}{25}=\dfrac{168}{100}=1,68\)
9/5 =18/10=1,8
2/25 =8/100=0,08
23/8 =2874/1000=2,874
76/4 =1900/100=19
42/25 =168/100=1,68
108*(23+7)=180*30=5400
215*86+215*14=215*(86+14)=215*100=21500
53*128-43*128=128*(53-43)=128*10=1280
mk đúng nha
108 x ( 23 + 7 )
= 108 x 30
= 3240
215 x 86 + 215 x 14
= 215 x ( 86 + 14 )
= 216 x 100
= 21600
53 x 128 - 43 x 128
= ( 53 - 43 ) x 128
= 10 x 128
=1280
165 . 23 - 218 .5 - 86 . 7
= (24)5 .23 - 218 .5 - (23)6 .7
= 220 .23 - 218 .5 - 218 .7
= 218 .(92 - 5 - 7)
= 218 .80
= 218 .16.5
= 218 .24.5
= 222 .5