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=(12+88) +(34+46)*2+(55+65)=100+2*80+120=100+160+120=380
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378 x 46 + 189 x 72 - 4 x 78 x 25
= 17388 + 13608 - ( 4 x 25 ) x 78
= 17388 + 13608 - ( 100 x 78 )
= 17388 + 13608 - 7800
= ( 17388 - 7800 ) + 13608
= 9588 + 13608
= 23196
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a) 81 + 35 + 19 = (81 + 19) + 35
= 100 + 35
= 135
b) 78 + 65 + 135 + 22 = (78 + 22) + (65 + 135)
= 100 + 200
= 300
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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
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\(789\times78+788\times22\)
\(=(788+1)\times78+788\times22\)
\(=1\times78+788\times78+788\times78\)
\(=78+788\times(78+22)\)
\(=78+788\times100\)
\(=78+78800\)
\(=78878\)
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78+78x3+39x12
= 78+78x3+39x2x6
=78+78x3+78x6
= 78 x (1 +3 +6)
= 78 x 10
= 780
=78 + 78 x 3 + 39 x 2 x 6
= 78+ 78 x 3 + 78 x 6
= 78 x (1+3+6)
= 78 x 10 = 780
k mk nha
78 + 46 + 22 + 34
= ( 78 + 22 ) + ( 46 + 34 )
= 100 + 80
= 180
78 + 46 + 22 + 34
= (78 + 22) + (46 + 34)
= 100 + 80
= 180