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a) 30 + 192 + 70 = 30 + 70 + 192
= 100 + 192 = 292
b) 50 + 794 + 50 = 50 + 50 + 794
= 100 + 794 = 894
c) 75 + 219 + 25 = 75 + 25 + 219
= 100 + 219 = 319
d) 725 + 199 + 125 = 725 + 125 + 199
= 850 + 199 = 1 049
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752 x 89 - 752 x 9 + 752 x 20
= 752 x ( 89 - 9 + 20 )
= 752 x ( 80 + 20 )
= 752 x 100
= 75200
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= ( 11 + 89 ) + ( 22 + 78 ) + ( 33 + 67 ) + ( 44 + 56 ) + 55
= 100 + 100 + 100 + 100 + 55
= 400 + 55
= 455
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=<89+11>+<78+22>+<67+33>+<56+44>+55
=100+100+100+100+55
=400+55
=455
![](https://rs.olm.vn/images/avt/0.png?1311)
Hướng dẫn giải:
a) 93 + 39 + 7 = (93 + 7) + 39 = 100 + 39 = 139.
89 + 85 + 11 = (89 + 11) + 85 = 100 + 85 = 185
184 + 66 + 16 = (184 + 16) + 66 = 200 + 66 = 266
b) 23 + 52 + 47 + 98 = (23 + 47) + (52 + 98) = 70 + 150 = 220
16 + 490 + 84 + 10 = (16 + 84) + (490 + 10) = 100 + 500 = 600
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a) \(38+42+46+50+54+58+62\)
\(=\left(38+62\right)+\left(42+58\right)+\left(46+54\right)+50\)
\(=100+100+100+50\)
\(=100\cdot3+50\)
\(=350\)
b) \(11+137+72+63+128+89\)
\(=\left(11+89\right)+\left(137+63\right)+\left(72+128\right)\)
\(=100+200+200\)
\(=300+200\)
\(=500\)
A) = (38 + 62) + (42 + 58) + (46 + 54) + 50
= 100 + 100 + 100 + 50
= 350
B) = (11 + 89) + (137 + 63) + (72 + 128)
= 100 + 200 + 200
= 500
![](https://rs.olm.vn/images/avt/0.png?1311)
89 : 0,2 + 89 + 89 : 0,25
= 89 x 5 + 89 x 1 + 89 x 4
= 89 x ( 1 + 5 + 4 )
= 89 x 10
= 890
89 : 0,2 + 89 + 89 : 0,25
= 89 : 0,2 + 89 : 1 + 89 : 0,25
= 89 : (0,2 + 1 + 0,25)
= 89 : 1,45
= 129,05
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2345 x 25 x 2345 x 74 + 2345
= 2345 x ( 25 + 74 + 1 )
= 2345 x 100 = 234 500
2345 x 25 x 2345 x74 +2345
=2345 x 25 x2345 x 74 +2345 x 1
= 2345 x ( 25+74 +1 )
=2345 x 100
=234500
89x25+74x89+89
=89x25+74x89+89x1
=89x(25+74+1)
=89x100
=8900
89 x 25 + 74 x 89 + 89= 89 x 25 + 74 x 89 + 89 x 1
= 89 x ( 25+74+1)
= 89 x 100
= 8900
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