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Bài 1: Thực hiện các phép tính sau:
\(a)\)Chưa rỏ đề
\(b)\)\(5025\div5-25\div5\)
\(=\)\(1005-5\)
\(=\)\(1000\)
\(c)\)\(218-180\div2\div9\)
\(=\)\(218-10\)
\(=\)\(208\)
\(d)\)\(\left(328-8\right)\div32\)
\(=\)\(320\div32\)
\(=\)\(10\)
Bài 1:
a) ( Tôi không nhìn rõ đầu bài )
b) 5025 : 5 - 25 : 5
= ( 5025 - 25 ) : 5
= 5000 : 5
= 1000
c) 218 - 180 : 2 : 9
= 218 - 180 : ( 2 . 9 )
= 218 - 180 : 18
= 218 - 10
= 208
d) ( 328 - 8 ) : 32
= 320 : 32
= 10
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a) (-25)-(-17)+24-12
=(-25)+17+24-12
=(-25)+(17+24-12)
=(-25)+29
=29-25=4
b) 4.(15-18)-(3-5)3^2
=4.(-3)-2.9
=-12-18
=-(12+18)=-30
a/
(-25)-(-17)+24-12
= -8 + 12
= 4
b/
4.(15-18)-(3-5).32
= 4.(-3)-(-2).9
= -12 - (-18)
= 6
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a) 12 : { 400 : [ 500 - ( 125 + 25 . 7 )]}
= 12 : { 400 : [ 500 - ( 125 + 175 )]}
= 12 : { 400 : [ 500 - 300 ]}
= 12 : { 400 : 200 }
= 12 : 2
= 6
b) 5 . 22 - 18 : 3
= 110 - 6
= 104
c) 18 : 3 + 182 + 3 . ( 51 : 17 )
= 6 + 182 + 3.3
= 6 + 182 + 9
= 197
d) 25.8 - 12.5 + 170 : 17 - 8
= 1000 - 60 + 10 - 8
= 940 + 10 - 8
= 940 + 2
= 942
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b/ (-127).57+(-127).43
=(-127)(57+43)
=(-127).10
=-1270
c/ (-13).34-87.34
=34.(-13-87)
=34.(-100)
=3400
a) (-14).(-125).(+3).(-8)
= [(-14).3].[(-125).(-8)]
= -42 . 1000
= -42000
b) (-127).57+(-127).43
= -127.(57+43)
= -127.100
= -12700
c) (-13).34-87.34
= 34.(-13-87)
= 34.(-100)
= -3400
d) (-25).68+(-34).(-250)
= - 1700 + 8500
= 6800 ( bài này không cần phải tính hợp lý )
tick nha các bạn yêu quý
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`Answer:`
a. \(-\frac{17}{30}-\frac{11}{-15}+-\frac{7}{12}\)
\(=-\frac{17}{30}+\frac{11}{15}-\frac{7}{12}\)
\(=-\frac{17}{30}+\frac{22}{30}-\frac{7}{12}\)
\(=\frac{1}{6}-\frac{7}{12}\)
\(=-\frac{5}{12}\)
b. \(-\frac{5}{9}+\frac{5}{9}:\left(\frac{5}{3}-\frac{25}{12}\right)\)
\(=-\frac{5}{9}+\frac{5}{9}:\left(-\frac{5}{12}\right)\)
\(=\frac{5}{9}.\left(-1\right)+\frac{5}{9}.\left(-\frac{12}{5}\right)\)
\(=\frac{5}{9}.\left(-1-\frac{12}{5}\right)\)
\(=\frac{5}{9}.\frac{-17}{5}\)
\(=-\frac{17}{9}\)
c. \(-\frac{7}{25}.\frac{11}{13}+-\frac{7}{25}-\frac{2}{13}-\frac{18}{25}\)
\(=\frac{77}{325}-\left(\frac{7}{25}+\frac{18}{25}\right)-\frac{2}{13}\)
\(=\frac{77}{325}-1-\frac{2}{13}\)
\(=-\frac{452}{325}\)
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\(160-\left(2^3.5^2-6.25\right)\)
\(=160-\left(8.25-6.25\right)\)
\(=160-\left[\left(8-6\right).25\right]\)
\(=160-\left[2.25\right]\)
\(=160-50\)
\(=110\)
~ Hok tốt ~
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1.
a) -75:(/x/-15)=25 <=> /x/-15= (-75):25
<=>/x/-15= -3
<=>/x/= (-3)+15=12
=> x= 12 hoặc x=-12
b) (40-/x/)+35= -21 <=> 40-/x/= (-21)-35=-56
<=> /x/=40-(-56)= 96
=> x= 96 hoặc x=-96
2. a) 45-(145+28)+(-55+128)
=45-145-28-55+128
=-(145-45)-55+(128-28)
= (-100)-55+100= 0-55=-55
b)\(\left(-4\right)^2.25-\left(-5\right)^2.14+\left(-3\right)^3.26\)
\(=16.25-25+27.26\)
\(=16.25-25.1+27.\left(25+1\right)\)
\(=16.25-25.1+27.25+27.1\)
\(=25.\left(16-1+27\right)+27\)
\(=25.42+27\)\(=1050+27=1077\)
Cho * mih vs.
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a,113-3+20
=1328+20
=1348
b,300+7781+1425
=9506
c,7+36-40
=43-40=3
a,
115 : 112 - 33 : ( 11 + 23 ) + 22 x 30 x 5
= 11( 5 - 2 ) - 27 : ( 1 + 8 ) + 4 x 1 x 5
= 113 - 27 : 9 + 4 x 5
= 1331 - 3 + 20
= 1328 + 20
= 1348
b,
12 x 25 + 31 x 251 + 57x 25
= 12 x 25 + 57 x 25 + 31 x 251
= ( 12 + 57 ) x 25 + 31 x 251
= 69 x 25 + 31 x 251
= 1725 + 7781
= 9506
c,
15 - 23 + 4 x 32 - 5 x 8
= 15 - 8 + 4 x 9 - 40
= 15 - 8 + 36 - 40
= 7 + 36 - 40
= 43 - 40
= 3