Question

15、分解因式;x(x-y)-y(y-x) 16、小雨同学在计算34.3乘以17.1加上82.5乘以17.1减去26.8

Answer 1

15、分解因式;x(x-y)-y(y-x)

x(x-y)-y(y-x)

=x(x-y)+y(x-y)

=(x+y)(x-y)

16、小雨同学在计算34.3乘以17.1加上82.5乘以17.1减去26.8乘以17.1加上10乘以17.1 .

34.3×17.1+82.5×17.1-26.8×17.1+10×17.1

=(34.3+82.5-26.8+10)×17.1

=100×17.1

=1710