48*4*2+42*8+5*16
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32 : 8 = 4
24 : 8 = 3
40 : 5 = 8
16 : 8 = 2
42 : 7 = 6
36 : 6 = 6
48 : 8 = 6
48 : 6 = 8
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Tính nhanh :
\(a.1+2+3+...+98+99+100\)
\(=\left(100+1\right).100:2\)
\(=101.100:2\)
\(=10100:2\)
\(=5050\)
\(b.16.48+8.48+16.28\)
\(=48.\left(16+8\right)+16.28\)
\(=48.24+16.28\)
\(=1152+448\)
\(=1600\)
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48 x 4 x 2 + 42 x 8 + 5 x 16
= 48 x 8 + 42 x 8 + 5 x 16
= ( 42 + 48 ) x 8 + 5 x 16
= 90 x 8 + 80
= 90 x 8 + 10 x 8
= ( 90 + 10 ) x 8
= 100 x 8
= 800
48 x 4 x 2 + 42 x 8 + 5 x 16
=96x4+84x4+20x4
=4.(96+84+20)=
200x4
=800
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a) 7 x 5 = 35 7 x 6 = 42 7 x 8 = 56 7 x 4 = 28
35 : 7 = 5 42 : 7 = 6 56 : 7 = 8 28 : 7 = 4
b) 42 : 7 = 6 35 : 7 = 5 63 : 7 = 9 16 : 2 = 8
14 : 7 = 2 49 : 7 = 7 7 : 7 = 1 48 : 6 = 8
28 : 7 = 4 70 : =10 21 : 7 = 3 56 : 7 = 8
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a) 460 + 85.4 = ( x + 200 ) : 4
=> x = 3000
b) => x = 2595
c) => x = 50
d) => x = 40
a)460 +85 . 4 = (x+200) :4 b)x:15+42=15+25.8
suy ra : 460+340=(x+200):4 suy ra: x:15+42=15+200
suy ra: 800= (x+200):4 suy ra : x:15+42=215
suy ra : 800.4=x+200 suy ra: x:15=215-42
suy ra : 3200=x+200 suy ra : x:15=173
suy ra: x= 3200-200 suy ra : x=173.15
suy ra : x=3000 vậy x =3000 suy ra: x=2595 vậy x = 2595
c) x-32:16=48 d)x-6:2-(48-24.2:6-3)=0
suy ra :x-2=48 suy ra : x-6:2-(48-48:6-3)=0
suy ra :x=48+2 suy ra : x-6:2-(48-8-3)=0
suy ra : x=50 suy ra : x-6:2-(40-3)=0
vậy x=50 suy ra : x-6:2 - 37=0
suy ra : x-3-37=0
suy ra : x-3=0+37
suy ra : x-3=37
suy ra : x=37+3
suy ra :x=40 vậy x= 40
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 460 + 85 . 4 = ( x + 200 ) : 4
460 + 340 = ( x + 200 ) : 4
( x + 200 ) : 4 = 800
x + 200 = 800 . 4 = 3200
x = 3200 - 200
x = 3000
C1: 48 x 4 x 2 + 42 x 8 + 5 x 16
= 384 + 336 + 80
= 720 + 80
= 800
C2: 48 x 4 x 2 + 42 x 8 + 5 x 16
= 48 x 8 + 42 x 8 + 5 x 2 x 8
= 48 x 8 + 42 x 8 + 10 x 8
= ( 48 + 42 + 10 ) x 8
= 100 x 8
= 800
48 x 4 x 2 + 42 x 8 + 5 x 16
= 48 x 8 + 42 x 8 + 10 x 8
= 8 x (48 + 42 + 10)
= 8 x 100
= 8000
Ủng hộ mk nha ^_-