问题
解答题
算一算.
|
答案
①3.25×0.45+6.75×0.45,
=0.45×(3.25+6.75),
=0.45×10,
=4.5;
②31.5-24.5÷3.5,
=31.5-7,
=24.5;
③7.5×102,
=7.5×(100+2),
=7.5×100+7.5×2,
=750+15,
=765;
④6.3+3.7×2.8,
=6.3+10.36,
=16.66.
算一算.
|
①3.25×0.45+6.75×0.45,
=0.45×(3.25+6.75),
=0.45×10,
=4.5;
②31.5-24.5÷3.5,
=31.5-7,
=24.5;
③7.5×102,
=7.5×(100+2),
=7.5×100+7.5×2,
=750+15,
=765;
④6.3+3.7×2.8,
=6.3+10.36,
=16.66.