解:根据提取公因式的方法,
原式=2.18×8.7+21.8×0.13
=2.18x8.7+2.18x1.3
=2.18x(8.7+1.3)
=2.18x10
=21.8
=2.18X8.7十2.18X1.3
=2.18X(8.7十1.3)
=2.18X10
=21.8
=2.18×8.7+2.18×10×0.13
=2.18×(8.7+1.3)
=2.18×10
=21.8
2.18×8.7+21.8×0.13
=2.18×8.7+2.18×1.3
=2.18×(8.7+1.3)
=2.18×10
=21.8