jika a=2/7, b=3/4, c=7/10 maka nilai dari a(b+c)-bc Tolong dijawab yahh

2/7 (3/4+7/10) - 3/4 x 7/10
2/7 (15/20+14/20) - 21/40
2/7 (29/20) - 21/40
58/140 - 21/40
116/280 - 147/280= -131/280