0.57x6.2+5.7x0.38
=0.57x6.2+0.57x3.8
=0.57x(6.2+3.8)
=0.57x10
=5.7
0.57×6.2+5.7×0.38
=0.57×6.2+0.57×10×0.38
=0.57×6.2+0.57×3.8
=0.57×(6.2+3.8)
=0.57×10
=5.7
根据题意:0.57X6.2+5.7X0.38
=0.57x6.2+0.57X10X0.38
=0.57X6.2+0.57x3.8
=0.57X(6.2+3.8)
=0.57x10
=5.7