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\(386\times62+386\times a\)\(=38600\)
\(\Leftrightarrow386\times\left(62+a\right)=38600\)
\(\Leftrightarrow62+a=38600:386\)
\(\Leftrightarrow62+a=100\)
\(\Rightarrow a=100-62\)
\(a=38\)
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386 x 156 + 386 - 57 x 386
= 386 x (156 +1 - 57)
= 386 x 100 = 38600
![](https://rs.olm.vn/images/avt/0.png?1311)
386 – ( 287 + 386 ) – ( 13 + 0 )
= 386 – 287 – 386 – 13
= ( 386 – 386 ) – ( 287 + 13 )
= 0 – 300
= -300
#Y/n
a) 386 – (287 + 386) – (13 + 0)
= 386 – 287 – 386 – 13
= (386 – 386) – (287 + 13)
= 0 – 300
= - 300
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{9}{25}=\dfrac{36}{100}=0,36\)
b) \(\dfrac{7}{4}=\dfrac{175}{100}=1,75\)
c) \(\dfrac{56}{200}=\dfrac{28}{100}=0,28\)
d) \(\dfrac{386}{300}=\dfrac{193}{150}\)
Bạn xem lại đề ý d!
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3.22a. 32 – 34 + 36 – 38 + 40 – 42
= - (34 – 32) – (38 – 36) – (42 – 40)
= - (2 + 2 + 2)
= - 6.
3.22b. 92 - (-55-8) + (-45)
= 92 - (-63) - 45
= 92 + 63 - 45
= 155 - 45
=110
3.23a. 386 – (287 + 386) – (13 + 0)
= 386 – 287 – 386 – 13
= (386 – 386) – (287 + 13)
= 0 – 300
3.23b. 332 – (681 +232 – 431)
= 332 - 681 - 232 + 431
= (332 - 232) + ( -681 + 431)
= 100 + (-250)
= -150
( 386 × 3 : 18 ) : ( 386 : 6 )
= \(\frac{193}{3}\) : \(\frac{193}{3}\)
= \(\frac{193+193}{3}\) = \(\frac{386}{3}\)
Đáp án = \(\frac{386}{3}\)