简便计算1.7×0.31+6.9×0.17
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简便计算1.7×0.31+6.9×0.17简便计算1.7×0.31+6.9×0.17简便计算1.7×0.31+6.9×0.171.7×0.31+6.9×0.17=1.7×0.31+0.69×1.7=1
简便计算1.7×0.31+6.9×0.17
简便计算1.7×0.31+6.9×0.17
简便计算1.7×0.31+6.9×0.17
1.7×0.31+6.9×0.17
=1.7×0.31+0.69×1.7
=1.7×(0.31+0.69)
=1.7×1
=1.7
1.7*（0.31+0.69）=1.7*1=1.7