+) \(a.62+a.48=4200\)
⇔ \(a.110=4200\)
⇒ \(a=\dfrac{420}{11}\)
+) \(a.186-a.86=3400\)
⇔ \(a.100=3400\)
⇒ \(a=34\)
\(1,a\times\left(62+48\right)=4200\\ a\times100=4200\\ a=4200:100=42\\ 2,a\times\left(186-86\right)=3400\\ a\times100=3400\\ a=3400:100=34\)
a x 62 + a x 48=4200 a x 186 - a x 86 = 3400
a x (62+48) =4200 a x (186-86) = 3400
a x 110 =4200 a x 100 =3400
a =4200:110 a =3400:100
a =420/11 a = 34
a x 62 + a x 48 = 4200
a x ( 62 + 48 ) = 4200
a x 110 = 4200
a = 4200 : 100
a = 420/11 ( phép này dư )
a x 186 - a x 86 = 3400
a x ( 186 - 86 ) = 3400
a x 100 = 3400
a = 3400 : 100
a = 34
a x 62 + a x 48 = 4200
a x ( 62+48 ) = 4200
a x 110 = 4200
a = 4200 : 110
a = 420 (dư 11)
a x 186 - a x 86 = 3400
a x ( 186 - 86 ) = 3400
a x 100 = 3400
a = 3400 : 100
a = 34
1,a×(62+48)=4200a×100=4200a=4200:100=422,a×(186−86)=3400a×100=3400a=3400:100=34
