问题
解答题
怎样算简便就怎样算
①9.5-9.5×(9.5-9.5)÷9.5
②12.5×4×0.25×80
③45.893-(3.7+25.893)
④20-[8.07+(7.54-3.86)].
答案
①9.5-9.5×(9.5-9.5)÷9.5,
=9.5-9.5×0÷9.5,
=9.5-0,
=9.5;
②12.5×4×0.25×80,
=(12.5×80)×(4×0.25),
=1000×1,
=1000;
③45.893-(3.7+25.893),
=45.893-3.7-25.893,
=(45.893-25.893)-3.7,
=20-3.7,
=16.3;
④20-[8.07+(7.54-3.86)],
=20-[8.07+3.68],
=20-11.75,
=8.25.