\(a, 48.19+81.48\)
\(=49.(19+81)\)
\(=49.100=4900\)
\(b,23.134-34.23\)
\(=23.(134-34)\)
\(=23.100=2300\)
a, 48.19+81.48
= 48.(19+81)
= 48.100
= 4800
b, 23.134 - 34.23
= 23.(134 - 34)
= 23.100
= 2300
c,27.63+27.37
= 27.(63+37)
= 27.100
= 2700
d,64+125.147 - 47.125
= 64+125.(147 - 47)
= 64+125.100
= 64+12500
= 12564
e,(72 - 2.32) - 60
= (49 - 2.9) - 60
= (49 - 18) - 60
=31 - 60
= 31+(-60)
= - (60 - 34)
= -29
f, 102 - 60:(56:54 - 3.5)
= 100 - 60:(52 - 3.5)
= 100 - 60:(25 - 3.5)
= 100 - 60:(25 - 15)
= 100 - 60:10
= 100 - 6
= 94
g, 34.52+122 - 24.7 - 52
= 81.25+122 - 16.7 - 25
= 2025+122 - 112 - 25
= 2147 - 112 - 25
= 2035 - 25
= 2010
h, 74:72+[62 - (102 - 4.16)]
= 72+[36 - (100 - 4.16])
= 49+[36 - (100 - 4.16)]
= 49+[36 - (100 - 64)]
= 49+[36 - 36]
= 49+0
= 49
i, - 2015+145+( - 145)+15
= - 2015+[145+( - 145)]+15
= - 2015+0+15
= - 2015+15
= - ( 2015-15)
= - 2000
j, 25 - 18+( - 43)
= 7+ ( - 43)
= - (43 - 7)
= - 36
k, ( - 297) + 630 + 297 + ( - 330)
= [( - 297)+297]+630+( - 330)
= 0+630+( - 330)
= 630 - 330
= 300
l, ( - 25)+34+( - 75)+66
= [( - 25)+( - 75)]+(34+66)
= [ - (25+75)]+100
= ( - 100)+100
= 0
m, 568 - {5.[143 - (4 - 1)2 ]+10}:10
= 568 - {5.[143 - 32 ]+10}:10
= 568 - {5.[143 - 9]+10}:10
= 568 - {5.134+10}:10
= 568 - {670+10}:10
= 568 - 680:10
= 568 - 68
= 500
n, 107 - {38+[7.32 - 24:6+(9 - 7)3 ]}:15
= 107 - {38+[7.9 - 24:6+(9 - 7)3 ]}:15
= 107 - {38+[7.9 - 24:6+23 ]}:15
= 107 - {38+[7.9 - 24:6+8]}:15
= 107 - {38+[63 - 4+8]}:15
= 107 - {38+[59+8]}:15
= 107 - {38+67}:15
= 107 - 105:15
= 107 - 7
= 100
