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a) 17.13+17.42-17.35
=17.(13+42-35)
=17.20=340
b) [25.(18-42)-10]:4+6
=(25.2-10):4+6
=40:4+6=16
c) 36:32+23.22-32.3
=34+25-33
=81+32-27=86
d) B=3.42-22.3
=3.(16-4)
=3.12=36
e)20220+3.[52.10-(23-13)2]
=1+3.(250-100)
=1+450=451
g) 27.77+24.27-27
=27.(77+24-1)
=27.100=2700
h) 5.23+79:77-12020
=40+72-1
=89-1=88
i) 120:{54[50:2+(32-2.4)]}
=120:[54(25+1)]
=120:1404=10/117
\(a,3^3+3^2-\left(2^7:2^5+7^8:7^7\right)=27+9-\left(2^2+7\right)=36-11=25\)
\(b,27.77+27.27-27=27\left(77+27-1\right)=27.103=2781\)
\(c,52:\left(43-30\right)+144-16=52:13+128=4+128=132\)
\(f,3^2.101-3^2.101^0=3^2\left(101-101^0\right)=9\left(101-1\right)=9.100=900\)
a)27*77+24*27-27=27*(77+24-1)=27*100=2700
b)(-12)+(-9)+121+|-20|=-21+121+20=100+20=120
c)25*101-25*1010=25*101-25*1=25*(101-1)=32*100=3200
27. 77 + 24 . 27 - 27
= 27 . (77 + 24 - 1)
= 77 . 100
= 7700
Chúc bạn học tốt!
174:{2[36+(4^2-23)]}
=174:{2[36+(-7)]}
=174:{2.29}
=174:58
=3
\(174:\left\{2.\left[36+\left(4^2-23\right)\right]\right\}\)
\(=174:\left\{2.\left[36+\left(16-23\right)\right]\right\}\)
\(=174:\left\{2.\left[36+\left(-7\right)\right]\right\}\)
\(=174:\left\{2.29\right\}\)
\(=174:58\)
\(=3\)
\(27.77+24.27-27\)
\(=27.\left(77+24-1\right)\)
\(=27.100\)
\(=2700\)
\(174\div\left\{2\left[36+\left(4^2-23\right)\right]\right\}\)
\(=174\div\left\{2\left[36+\left(16-23\right)\right]\right\}\)
\(=174\div\left\{2\left[36+\left(-7\right)\right]\right\}\)
\(=174\div\left\{2.29\right\}\)
\(=174\div58\)
\(=3\)
\(3^2.4-\left[30-\left(5-2\right)^2\right]\)
\(=9.4-\left[30-3^2\right]\)
\(=36-\left[30-9\right]\)
\(=36-21\)
\(=15\)