thuc hien phep tinh
a)205 -[ 1200 -(4^2 -2 x3)^ 3 ]:140
b)[ (25 -2^2 x3 )+ (3^2 x4 +16) ] :5
Những câu hỏi liên quan
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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Thuc hien phep tinh
A, 3/7 + 1/2 - (-3)/70
B, 3/5 + -1/25 - 35/100
C, 5/12 - 3/-16 + 3/4
D, 5/15 + 4/-12 + 1/7 - 1/-6
a,3/7 +1/2-[-3]/70
=13/14 -[-3]/70
=65/70 -[-3]/70
=34/35
b,3/5+-1/25 -35/100
=14/25 - 35/100
=56 /100 -35/100
= 21/100
c ,5/12 -3/-16+3/4
=29/48 +3/4
= 29/48 +36/48
=65/48
d, 5/15 +4/-12 +1/7 -1/-6
= 1/3 +1/-3 +1/7-1/-6
=0+1/7-1/-6
= 13/42
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A.\(\dfrac{3}{7}+\dfrac{1}{2}+\dfrac{\left(-3\right)}{70}\)
=\([\dfrac{30}{70}+\dfrac{\left(-3\right)}{70}]\)+\(\dfrac{1}{2}\)
= \(\dfrac{27}{70}+\dfrac{35}{70}\)
=\(\dfrac{62}{70}=\dfrac{31}{35}\)
B.\(\dfrac{3}{5}+\dfrac{-1}{25}-\dfrac{35}{100}\)
=\(\dfrac{60}{100}+\dfrac{-4}{100}-\dfrac{35}{100}\)
=\(\dfrac{60+\left(-4\right)-35}{100}\)
=\(\dfrac{21}{100}\)
C.\(\dfrac{5}{12}-\dfrac{3}{-16}+\dfrac{3}{4}\)
=\(\left(\dfrac{5}{12}+\dfrac{9}{12}\right)-\dfrac{-3}{16}\)
=\(\dfrac{7}{6}-\dfrac{-3}{16}\)
=\(\dfrac{56}{48}-\dfrac{-9}{48}\)=\(\dfrac{65}{48}\)
D.\(\dfrac{5}{15}+\dfrac{4}{-12}+\dfrac{1}{7}-\dfrac{1}{-6}\)
=\(\dfrac{1}{3}+\dfrac{1}{7}+(\dfrac{-2}{6}-\dfrac{-1}{6})\)
=\(\dfrac{1}{3}+\dfrac{1}{7}+\dfrac{-1}{6}\)
=\((\dfrac{1}{3}+\dfrac{-1}{6})+\dfrac{1}{7}\)
=\(\dfrac{1}{6}+\dfrac{1}{7}\)=\(\dfrac{13}{42}\)
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thuc hien phep tinh :M=1+1/2(1+2)+1/3(1+2+3)+1/4(1+2+3+4)+...+1/16(1+2+3+...+16)
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) 32.(-1/2)3+1/4
b) 16.(1/2)2.1/2
c) 17/22+4/25+29/25+0,5+5/22
d) 3/11-7/15+8/11-8/15+0.25
Cac ban ghi cac buoc lam gjum mik nha
Thuc hien phep tinh(nhanh neu co the)
1024:2^4+140:(38+2^5)-49^22:7^21
thuc hien phep tinh
\(\dfrac{4^3+2^5+8^5}{8^3\times3+16+3^3}\)
thuc hien phep tinh a)6^2:4 x 3+2x5^2 b)5x4^2 -18:3^2
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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