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72,9 x 99 + 72 + 0,9= 72,9 x 99 + 72,9 = 72,9 x ( 99 + 1 ) = 72,9 x 100 = 7290
0,125 x 6,94 x 80 = 0,125 x 80 x 6,94 = 10 x 6,94 = 69,4
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,4,86\times0,25\times40\)
\(=4,86\times10\)
\(=48,6\)
\(b,0,125\times6,94\times80\)
\(=\left(0,125\times80\right)\times6,94\)
\(=10\times6,94\)
\(=69,4\)
\(c,96,28\times3,527+3,527\times3,72\)
\(=3,527\times\left(96,28+3,72\right)\)
\(=3,527\times100\)
\(=352,7\)
![](https://rs.olm.vn/images/avt/0.png?1311)
b) 38,25 + 21,64 - 18,25 - 11,64
= 38,25-18,25 + 21,64-11,64
=30
c) 4,86 x 0,25 x 40
= 4,86 x (0,25 x 40)
=48,6
e) 0,125 x 6,94 x 80
= (0,125 x 80) x 6,94
=69,4
a. 60 - (26,75 + 13,25) = 60 - 40 = 20
b. (38,25 - 18,25) + (21,64 - 11,64) = 20 + 10 = 30
c. 4,86 x (0,25 x 40) = 4,86 x 10 = 48,6
![](https://rs.olm.vn/images/avt/0.png?1311)
a)=4,86x10
=48,6
b)=10x6,94
=69,4
c)=72,9x99+72,9
=72,9x(99+1)
=72,9x100
=7290
d)=0,8x96+0,8x2x2
=0,8x(96+2x2)
=0,8x100
=80
a, = 4,86 x (0,25 x 40) = 4,86 x 10 = 48,6
b, = (0,125 x 80) x 6,94 = 10 x 6,94 = 69,4
k mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a)4,86a)4,86 x 0,260,26 x 4040
=4,86=4,86 x (0,26(0,26 x 40)40)
=4,86=4,86 x 10,410,4
=50,544=50,544
b)0,125b)0,125 x 6,946,94 x 8080
=(0,125=(0,125 x 80)80) x 6,946,94
= 10= 10 x 6,946,94
=69,4=69,4
c)96,28c)96,28 x 3,527+3,5273,527+3,527 x 3,723,72
=3,527=3,527 x (96,28+3,72)(96,28+3,72)
=3,527=3,527 x 100100
=352,7=352,7
d)72,9d)72,9 x 99+72+0,999+72+0,9
=72,9=72,9 x 99+72,999+72,9
=72,9=72,9 x ( 99 + 1 )`
=72,9=72,9 x 100100
=7290=7290
e)0,8e)0,8 x 96+1,696+1,6 x 22
=76,8+3,2=76,8+3,2
=80=80
f)21,3+6,72+8,7−5,22f)21,3+6,72+8,7-5,22
=(31,3+8,7)+(6,72−5,22)=(31,3+8,7)+(6,72-5,22)
=40+1,50=40+1,50
=41,5
Chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 4,86 * 0,25 * 40 = 4,86 * 10 = 48,6
b, 72,9 * 99 + 72 + 0,9 = 72,9 * 99 + 72,9 = 72,9 * 99 + 72,9 * 1 = 72,9 * 100 = 7290
c, 0,125 * 6,94 * 80 = 0,125 * 80 * 6,94 = 10 * 6,94 = 69,4
d, 096,28 * 3,527 + 3,527 * 3,72 = ( 096,28 + 3,72 ) * 3,527 = 100 * 3,527 = 352,7
a) 4,86 x 0,25 x 40
= 4,86 x 10
= 48,6
b) 72,9 x 99 + 72 + 0,9
= 72,9 x 99 + 72,9
= 72,9 x 99 + 72,9 x 1
= 72,9 x (99 + 1)
= 729
c) 0,125 x 6,94 x 80
= 0,125 x 80 x 6,94
= 10 x 6,94
= 69,4
d) 96,28 x 3,527 + 3,527 x 3,72
= 3,527 x (96,28 + 3,72)
= 3,527 x 100
= 352,7
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
4,86 x 0,25 x 40
= 4,86 x ( 0,25 x 40 )
= 4,86 x 10
= 48,6
72,9 x 99 + 72 +0,9
= 72,9 x 99 + ( 72 + 0,9 ) x 1
= 72,9 x 99 + 72,9 x 1
= 72 ,9 x ( 99 + 1 )
= 72,9 x 100
= 7200
0,125 x 6,94 x 80
=(0,125 x 80 ) x 6,94
= 10 x 6,94
= 69,4
![](https://rs.olm.vn/images/avt/0.png?1311)
4,86 * 0,25 * 40
= 4,86 * ( 0,25 * 40 )
= 4,86 * 10
= 48,6
4,86×0,25×40= 4,86×(0,25×4)×10
=4,86×1×10
=4,86×10
=48,6
0,8×96+1,6×2=0,8×96+0,8×2×2
=0,8×96+0,8×4
=0,8×(96+4)
=0,8×100
=80
72,9×99+72+0,9=72,9×99+72,9
=72,9×(99+1)
=72,9×100
=7290
0,125 x 6,94 x 80
= ( 0,125 x 80 ) x 6,94
= 10 x 6,94
= 69,4