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222-9+11+12:2*14+14 = ? ( )

## Toán Lớp 7: Hết điểm rồi Tính nhanh nha a) ( $\frac{-1}{4}$ ) . ( 6$\frac{2}{11}$ ) + 3$\frac{9}{11}$ . ( $\frac{-1}{4}$ ) b) 15$\frac{2}{3}$ . (

Toán Lớp 7: Hết điểm rồi Tính nhanh nha
a) ( $\frac{-1}{4}$ ) . ( 6$\frac{2}{11}$ ) + 3$\frac{9}{11}$ . ( $\frac{-1}{4}$ )
b) 15$\frac{2}{3}$ . ( $\frac{-1}{5}$ ) + 9$\frac{2}{3}$ . ( $\frac{-1}{5}$ )
c) 15$\frac{3}{4}$ . $\frac{-1}{3}$ + 14$\frac{1}{4}$ . ( $\frac{-1}{3}$ )

1. a)
((-1)/4).(6\frac{2}{11})+39/11.((-1)/4)
=((-1)/4).(6\frac{2}{11}+3\frac{9}{11})
=-0,25xx10
=-2,5
b)
152/3.((-1)/5)+92/3.((-1)/5)
=((-1)/5).(15\frac{2}{3}+9\frac{2}{3})
=-1/5xx76/3
=-76/15
c)
153/4.((-1)/3)+141/4.((-1)/3)
=((-1)/3).(15\frac{3}{4}+14\frac{1}{4})
=((-1)/3).30
=-10

2. a) (-1/4) . (6 2/11) + 3 9/11 . (-1/4)
= (-1/4) . (6 2/11 + 3 9/11)
= (-1/4) . 10
= -5/2
______________________________________
b) 15 2/3 . (-1/5) + 9 2/3 . (-1/5)
= (-1/5) . (15 2/3 + 9 2/3)
= (-1/5) . 76/3
= -76/15
_______________________________________
c) 15 3/4 . (-1/3) + 14 1/4 . (-1/3)
= (-1/3) . (15 3/4 + 14 1/4)
= (-1/3) . 30
= -10