Tìm a.
A)27,8×a+324=1297
B)a×2,6×1,5-12,94=200
C)(a+0,25)×7,5=115,88
-
a) 27,8 × a + 324 = 129727,8 × a = 1297 – 32427,8 × a = 973a = 973 : 27,8a = 35Vậy a = 35b) a × 2,6 × 1,5 – 12,94 = 200a × 3,9 – 12,94 = 200a × 3,9 = 200 + 12,94a × 3,9 = 212,94a = 212,94 : 3,9a = 54,6Vậy a = 54,6c) ( a + 0,25 ) × 7,5 = 115,88a + 0,25 = 115,88 : 7,5a + 0,25 = 5794/375a = 5794/375 – 0,25a = 22801/1500Vậy a = 22801/1500
-
Giải đáp:a)27,8 xx a+324=129727,8xx a=1297-32427,8xx a=973a=973: 27,8a=35Vậy a=35b)a xx 2,6 xx 1,5-12,94=200a xx(2,6xx1,5)=200+12,94a xx3,9=212,94a=212,94:3,9a=54,6Vậy a=54,6c)(a+0,25)xx7,5=115,88a+0,25=115,88:7,5a+0,25=\frac{5794}{375}a=\frac{5794}{375}-0,25a=\frac{22801}{1500}Vậy a={22801}/{1500}