①(9.15-0.45×3.6)÷0.3
=(9.15-1.62)÷0.3
=7.53÷0.3
=25.1;
②17.6-0.5×0.5-0.75
=17.6-0.25-0.75
=17.6-(0.25+0.75)
=17.6-1
=16.6;
③5.639-1.732-2.268
=5.639-(1.732+2.268)
=5.639-4
=1.639;
④62.3+3.91÷(22-19.7)
=62.3+3.91÷2.3
=62.3+1.7
=64;
⑤7.86×1.7-0.7×7.86
=7.86×(1.7-0.7)
=7.86×1
=7.86;
⑥0.8×[13-(3.12+5.28)]
=0.8×[13-8.4]
=0.8×4.6
=3.68.