问题 解答题
脱式计算,怎么简便就怎么算.
415-176-2415×27-3000÷258.29+3.7+0.71+6.3
125×89×8428×78+572×785625÷75+25.
答案

(1)415-176-24,

=415-(176+24),

=415-200,

=215;

(2)15×27-3000÷25,

=405-120,

=285;

(3)8.29+3.7+0.71+6.3,

=(8.29+0.71)+(3.7+6.3),

=9+10,

=19;

(4)125×89×8,

=(125×8)×89,

=1000×89,

=89000;

(5)428×78+572×78,

=(428+572)×78,

=1000×78,

=78000;

(6)5625÷75+25,

=75+25,

=100.

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