题目内容
怎样简便就怎样计算.
①4×+4÷ ②5××× ③41×101
④8.5-(5.6+4.8)÷1.3 ⑤12×(+-) ⑥-(-)
解:①4×+4÷,
=()×4,
=1×4,
=4;
②5×××,
=(5×)×(),
=4×,
=;
③41×101,
=41×100+41×1,
=4100+41,
=4141;
④8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
⑤12×(+-),
=12×+12×-12×,
=3+2-4,
=1;
⑥-(-),
=,
=-,
=.
分析:(1)(3)(5)运用乘法分配律解答,
(2)运用乘法交换律和结合律解答,
(4)依据四则运算顺序解答,
(6)运用减法性质解答.
点评:(1)正确运用简便方法解决问题,(2)依据四则运算顺序进行计算是本题考查知识点.
=()×4,
=1×4,
=4;
②5×××,
=(5×)×(),
=4×,
=;
③41×101,
=41×100+41×1,
=4100+41,
=4141;
④8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
⑤12×(+-),
=12×+12×-12×,
=3+2-4,
=1;
⑥-(-),
=,
=-,
=.
分析:(1)(3)(5)运用乘法分配律解答,
(2)运用乘法交换律和结合律解答,
(4)依据四则运算顺序解答,
(6)运用减法性质解答.
点评:(1)正确运用简便方法解决问题,(2)依据四则运算顺序进行计算是本题考查知识点.
练习册系列答案
相关题目