Question

初一数学书上69页练习题和71页习题2.2的第1题的答案

Answer 1

69页的都有答案

71页习题2.2

2x-10.3x

=(2-10.3)x

=-8.3x

3x-x-5x

=(3-1-5)x

=-3x

-b+0.6b-2.6b

=(-1+0.6-2.6)b

=-3b

m-n2+m-n2

=(1-1)m-(-1-1)n2

=-2n2(n2为n的平方)