2平方加0.7倍减去0.15,等等.0
问题描述:
2平方加0.7倍减去0.15,等等.0
答
2倍?.7 X-0.15 =
0.40 4-3 = 0,(2×1)(20×3)= 0中,x = -1 / 2中,x = 3/20.