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a) 52 . 2 - 32 . 4 b) 58 . 75 + 58. 50 - 58 . 25
= 25 . 2 - 9 . 4 = 58 . ( 75 + 50 - 25 )
= 50 - 36 = 58 . 100
= 14 = 5800
1: \(=-145\cdot13+145\cdot57+57\cdot10-57\cdot145=-1315\)
2: \(=17\cdot15-17\cdot16+16\cdot17-16\cdot20=255-320=-65\)
3: \(=-38\cdot25+38\cdot4-25\cdot4+25\cdot38=13\cdot4=52\)
4: \(=23\cdot145-23\cdot17-145\cdot23+145\cdot6=479\)
5: \(=24\cdot15-24\cdot4+4\cdot24-4\cdot15=360-60=300\)
6: \(=199\left(15-17+17-5\right)=199\cdot10=1990\)
7: \(=-39\cdot5+39\cdot99+99\cdot10-99\cdot39=795\)
\(107-\left\{38+\left[7.3^2-24:6+\left(9-7\right)^3\right]\right\}:15\)
\(=107-\left\{38+\left[7.3^2-24:6+2^3\right]\right\}:15\)
\(=107-\left\{38+\left[7.3^2-4+2^3\right]\right\}:15\)
\(=107-\left\{38+\left[63-4+2^3\right]\right\}:15\)
\(=107-\left\{38+\left[59+2^3\right]\right\}:15\)
\(=107-\left\{38+67\right\}:15\)
\(=107-105:15\)
\(=107-7\)
\(=100\)
107 – {38 + [7.32 – 24 : 6+(9 – 7)3]}:15
= 107 - {38+ [7.32 - 24 : 6 + 23 ]} : 15
= 107 - {38 + [ 7.9 - 24 : 6 + 8]} :15
= 107 - {38+[ 63 - 4 + 8]} : 15
= 107 - {38 + 67} : 15
= 107 - 105 : 15
= 107 - 7
= 100
17) 10 – [(82 – 48).5 + (23.10 + 8)] : 28 - 70
= 10 - [(64 - 48).5 + (8.10 +8)] : 28 - 70
= 10 - [16.5 + 88] : 28 - 70
= 10 - [80 + 88] : 28 - 70
= 10 - 168 : 28 - 70
= 10 - 6 - 1
= 3
nếu sai câu nào mong bạn thông cảm ^^
a) 58.75+58.50-58.25
=58.(75+50-25)
=58.100
=5800
b) \(20:2^2-5^9:5^8\)
\(20:4-5\)
\(5-5=0\)
c)\(\left(5^{19}:5^{17}-4\right):7\)
\(\left(5^2-4\right):7\)
\(\left(25-4\right):7\)
\(21:7\)
=\(3\)
d) \(84:4+3^9:3^7+5^0\)
\(=21+3^2+1\)
\(=21+9+1\)
\(30+1=31\)
e) \(295-\left(31-2^2.5\right)^2\)
\(295-\left(31-4.5\right)^2\)
\(295-\left(31-20\right)^2\)
\(295-\left(11\right)^2\)
\(295-121\)
\(=174\)
f) \(11^{25}:11^{23}-3^5:\left(1^{10}\right)+2^3-60\)
\(11^2-243:1+8-60\)
\(121-243+8-60\)
\(-122+8-60\)
\(-114-60\)
\(=-174\)
a) 52.2 – 32.4 b) 58.75 + 58.50 – 58.25
c) 107 – {38 + [7.32 – 24 : 6 + (9 – 7)3]}:15 d) (-23) + 13 + ( - 17) + 57