thuc hien phep tinh:-38.(25-4)+25.(-4+38)
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Thuc hien phep tinh(nhanh neu co the)
1024:2^4+140:(38+2^5)-49^22:7^21
thuc hien phep tinh
125 (28+72 ) - 25 (3^2 .4 +64 )
\(125.\left(28+72\right)-25.\left(3^2.4+64\right)\)
\(=125.100-25.\left(9.4+64\right)\)
\(=125.100-25.\left(36+64\right)\)
\(=125.100-25.100\)
\(=100.\left(125-25\right)\)
\(=100.100\)
\(=10000\)
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125.(28+72)-25.(3^2.4+64)
=125.100-25.(9.4+64)
=125.100-25.(36+64)
=125.100-25.100
=100.(125-25)
=100.100
=100^2
=10 000
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thuc hien phep tinh
19.126+37 .38
\(19.126+37.38\)
\(=2394+1406\)
\(=3800\)
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Thuc hien phep tinh
A/-120 - 18×(-5+6)
B/465+(-38)+(-465)+10+(-42)
A, ( - 120 ) - 18 x ( - 5 + 6 )
= ( - 120 ) - 18 x 1
= ( - 120 ) - 18
= - 138
B, 465 + ( - 38 ) + ( - 465 ) + 10 + ( - 42 )
= 0 + ( - 38 ) + 10 + ( - 42 )
= ( - 80 ) + 10
= - 70
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THUC HIEN PHEP TINH ( TINH NHANH NEU CO THE ) :
1) ( 56 x 46 - 25 x 23 ) : 23
2) ( 28 x 54 + 56 x 36 ) : 21 : 2
3) ( 76 x 34 - 19 x 64 ) : ( 38 x 9 )
4) ( 2 + 4 + 6 + .... + 100 ) x ( 36 x 333 - 108 x 111 )
5) ( 5x 411 - 3 x 165 ) : 410
6) 7256 x 4375 - 725
3650 + 4375 x 7255
Thuc hien phep tinh :
a) 4 phan 5 + -7 phan 15 . 1, 25
b) 2 phan 5 + 3 phan 5 . ( 4 1phan2 - 3,25)
\(\frac{4}{5}+\frac{-7}{15}.1,25\)
\(=\frac{4}{5}+\frac{-7}{12}\)
\(=\frac{13}{60}\)
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a) \(\frac{4}{5}\)+\(\frac{-7}{15}\) x \(1,25\)
= \(\frac{4}{5}\)+ \(\frac{-7}{15}\)x \(\frac{5}{4}\)
= \(\frac{4}{5}\)+\(\frac{-7}{12}\)
= \(\frac{48}{60}\)+ \(\frac{-35}{60}\)
= \(\frac{13}{60}\)
b \(\frac{2}{5}\)+ \(\frac{3}{5}\)x \(\left(4\frac{1}{2}-3,25\right)\)
= \(\frac{2}{5}\)+\(\frac{3}{5}\)x \(\left(\frac{9}{2}-\frac{13}{4}\right)\)
=\(\frac{2}{5}\)+\(\frac{3}{5}\)x\(\frac{5}{4}\)
=\(\frac{2}{5}\)+\(\frac{3}{4}\)
= \(\frac{8}{20}\)+\(\frac{15}{20}\)
=\(\frac{23}{20}\)
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thuc hien phep tinh
a)205 -[ 1200 -(4^2 -2 x3)^ 3 ]:140
b)[ (25 -2^2 x3 )+ (3^2 x4 +16) ] :5
a: \(=205-\left[1200-\left(16-6\right)^3\right]:140\)
\(=205-\left[1200-10^3\right]:140\)
\(=205-\dfrac{200}{140}=205-\dfrac{10}{7}=\dfrac{1425}{7}\)
b: \(=\left[25-4\cdot3+9\cdot4+16\right]:5\)
\(=\left(25-12+36+16\right):5=\dfrac{65}{5}=13\)
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Bai 1:thuc hien phep tinh:
a)(-25).(-3).(-4)
b)17-25+55-17
c)35.18-5.7.28
d)_/_17/+2.[24:(_8)+(_5)2]
a)(-25).(-3).(-4)
= [ (-25) . (-4) ] .(-3)
= 100 . (-3) = -300
b)17-25+55-17
= (17-17) + (-25+55)
= 0 + 30 = 30
c)35.18-5.7.28
= 35 . 18 - 35 . 28
= 35 . (18-28)
= 35 . (-10)
= -359.
d, \(|-7|\)+ 2 . [ 24 : (-8) + (-5) 2)
= 7 + 2 . [ (-3) + 25 )
= 7 + 2. 22
= 7 + 44 = 51
Hok tốt !
a)(-25).(-3).(-4)
=75.(-4)
=-300
d)-|-17+2.[24:(-8)+(-5)2]
=-17+2.[-3+25]
=-17+2.22
=-17.44
=-748
Thuc hien phep tinh sau bang cach hop li nhat:
a)5/11+1/2+2/5+6/11+3/4+16/25+5/16
b)19/4+37/100+1/8+132/25+5/2+37/12
5/11+1/2+2/5+6/11+3/4+16/25+5/16
=1441/400
19/4+37/100+1/8+132/25+5/2+37/12
=1933/120
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Ban lam sao duooc nhu the giai ra cho minh voi
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