Question

计算9.98的2次幂= 17的2次幂+26乘17+13的2次幂=

Answer 1

9.98的2次幂

=(10-0.02)^2

=10^2-2x10x0.02+0.02^2

=100-0.4+0.0004

=99.6004

17的2次幂+26乘17+13的2次幂

=17^2+2x13x17+13^2

=(17+13)^2

=30^2

=900

注：^2表示平方(也就是2次幂)