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21.35-3.25.7
= 21.35-21.25
= 21.(35-25)
= 21. 10
=210
77 - 11.( 30+7)
= 11.7 -11.30 -11.7
= 11.7-11.7 -11.30
= -11.30
= -330
21.35-3.25.7=210
77-11(30+7)=-330
85(35-27)-35(85-27)=-1350
47(45-15)-47(45+15)=-2820
nhân hết ra là xong nha
a) 85x35-85x27-35x85+35x27=27x(35-85)=-1350
mấy cái kia cũng tương tự v
_Kudo_
a)-35+(-4).4.5+(-2)5
=-35-4.4.5+(-32)
=-35-16.5-32
=-35-80-32
=-115-32
=-147
b)-(238)+113-213-(122)
=-234+113-213-122
=-121-213-122
=-334-122
=-456
c)17.(-27)+(-17).73
=-17.27+(-17).73
=-17.(27+73)
=-17.100
=-1700
a) \(-75+\left(-325\right)+\left|-45\right|-\left(-125\right)\)
\(=-75-325+45+125\)
\(=\left(45+125\right)-\left(75+325\right)\)
\(=170-400\)
\(=-230\)
b) \(62+\left|128\right|-\left|-155\right|-\left|70\right|\)
\(=62+128-155-70\)
\(\Leftrightarrow190-225\)
\(=-35\)
c) \(815+\left[95+\left(-815\right)+\left(-45\right)\right]\)
\(=815+95-815-45\)
\(=\left(815-815\right)+\left(95-45\right)\)
\(=0+50\)
\(=50\)
d) \(5+\left(-7\right)+9+\left(-11\right)+...+25+\left(-27\right)\)
\(=\left(5-7\right)+\left(9-11\right)+...+\left(25-27\right)\)
\(=-2-2-...-2\)
\(=-2.11\)
\(=-22\)
e) \(34+35+36+37-24-25-26-27\)
\(=\left(34-24\right)+\left(35-25\right)+\left(36-26\right)+\left(37-27\right)\)
\(=10+10+10+10\)
\(=40\)
a)=27+65+346-27-65
=(27-27)+(65-65)+346
=0+0+346
=346
b)=42+69-17-42+17-35
=(42-42)+(17-17)+(69-35)
=0+0+34
=34
\(\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{200.201}\)
\(=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{200}-\frac{1}{201}\)
\(=\frac{1}{2}-\frac{1}{201}\)
\(=\frac{201}{402}-\frac{2}{402}\)
\(=\frac{199}{402}\)
(-27).35-35.38+35.(-45)+35.10
=(-27).35+35.(-38)+35.(-45)+35.10
=35.[-27+(-38)+(-45)+10]
=35.(-100)
=-3500
( -27) . 35 - 35 . 38 + 35. ( - 45 ) + 35 .10
= 35 . [ ( - 27 ) - 38 - 45 + 10 ]
= 35 . [ - 65 - 45 + 10 ]
= 35 . [ - 110 + 10 ]
= 35 . ( - 100)
= - 3500
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