能简算的要用简便方法计算24.1×1.5+7.59×15
1个回答

解题思路:①、⑤运用乘法分配律的逆运算简算;

②、③、⑥按运算顺序进行计算;

④把8.8拆成8+0.8,与0.125进行简算.

①24.1×1.5+7.59×15,

=2.41×15+7.59×15,

=(2.41+7.59)×15,

=10×15,

=150;

②(3.7+17×0.4)÷3.5,

=(3.7+6.8)÷3.5,

=10.5÷3.5,

=3;

③75.36÷12-4.32×0.5,

=6.28-2.16,

=4.12;

④8.8×0.125,

=(8+0.8)×0.125,

=8×0.125+0.8×0.125,

=1+0.1,

=1.1;

⑤7.6×5.3+3.7×7.6,

=(5.3+3.7)×7.6,

=9×7.6,

=68.4;

⑥6.6÷(0.68+0.42),

=6.6÷1.1,

=6.

点评:

本题考点: 小数四则混合运算;运算定律与简便运算.

考点点评: 此题考查学生的运算顺序,以及灵活运用运算定律进行简算的能力.