2a(a+b)-b(2a-b)-b(b+1)
2(-0.3)(-0.3-0.4) - (-0.4)(2(-0.3)-(-0.4)) - (-0.4)(-0.4+1)
2(-0.3)(-0.7) - (-0.4)(-0.6-0.4) - (-0.4)(0.6)
2(0.21) - (-0.4)(-1) - (-0.4)(0.6)
0.42 + 0.4 - 0.24
0.58
Ответ: 0.58
2a(a+b)-b(2a-b)-b(b+1)
2(-0.3)(-0.3-0.4) - (-0.4)(2(-0.3)-(-0.4)) - (-0.4)(-0.4+1)
2(-0.3)(-0.7) - (-0.4)(-0.6-0.4) - (-0.4)(0.6)
2(0.21) - (-0.4)(-1) - (-0.4)(0.6)
0.42 + 0.4 - 0.24
0.58
Ответ: 0.58