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25 - (20 - 10)=15
80 - (30 + 25)=25
125 + (13 + 7)=145
416 - (25 - 21)=412
(65 + 15) x 2=160
46 : (6 : 3)=23
(74 - 14) : 2=30
81 : (3 x 3)=9
123 x (42 - 40)=246
(100 + 11) x 9=999
72 : (2 x 4)=9
64 : (8 : 4)=32
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a ) 2 x 3 x 5 x 7
= ( 2 x 5 ) x 3 x 7
= 10 x 21
= 210
b ) 50 x 9 x 9 x 2
= ( 50 x 2 ) x 9 x 9
= 100 x 81
= 8100
c ) 13 x 25 x 3 x 4
= ( 25 x 4 ) x 13 x 3
= 100 x 39
= 3900
d ) 7 x 125 x 7 x 8
= ( 125 x 8 ) x 7 x 7
= 1000 x 49
= 49000
e ) 25 x 32 x 125
= 800 x 125
= 100000
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a) 450 – ( 25 – 10) = 450 – 15
= 435
450 – 25 – 10 = 425 – 10
= 415
b) 180 : 6 : 2 = 30 : 6
= 15
180 : ( 6 : 2 ) = 180 : 3
= 60
c) 410 – (50 +30) = 410 -80
= 330
410 - 50 + 30 = 360 + 30
= 390
d) 16 x (6 : 3) = 16 x 2
= 32
16 x 6 : 3 = 96 : 3
= 32
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4 x 4 + 29 = 16 + 29 20 : 4 x 3 = 5 x 3
= 45 = 15
3 : 3 x 0 = 1 x 0 25 : 5 x 1 = 5 x 1
= 0 = 5
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x : 5 = 13 x : 6 = 25 x : 3 = 48
x = 13 x 5 x = 25 x 6 x = 48 x 3
x = 65 x = 150 x = 144
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a. 4 x 126 x 25
= (4 x 25) x 126
= 100 x 126
= 12600
b. (9 x 8 – 12 – 5 x 12) x ( 1 + 2 + 3 + 4 + 5)
= (72 – 12 – 60) x ( 1 + 2 + 3 + 4 + 5)
= 0 x ( 1 + 2 + 3 + 4 + 5)
= 0
\(=25\times\left(2+3-3\right)\)
\(=25\times2\)
\(=50\)
\(25\left(2+3-3\right)\)
\(=25\cdot2\)
\(=50\)