386×62+386×a=38600; Vậy a=
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](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)
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)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a, 386-287 -386 -13
= (386-386) -287-13
= 0 -300
=-300
b, =332-681 -232+431
= (332 -232) +(431-681)
= 100 - 250
= -150
Bài 2
a, = 27+65+ 364-27-65
= (27-27) +(65-65) +364
= 0+0+ 364
=364
b, = 42-69+17 -42-17
= (42-42) + (17-17) -69
= -69
chúc bạn học tốt nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
386.62+386.a=38600
386.(62+a)=38600
62+a=100
a=38
\(386\times62+386\times a\)\(=38600\)
\(\Leftrightarrow386\times\left(62+a\right)=38600\)
\(\Leftrightarrow62+a=38600:386\)
\(\Leftrightarrow62+a=100\)
\(\Rightarrow a=100-62\)
\(a=38\)