题目内容
【题目】计算下列各题,能简算的要简算
① ×6﹣4÷
②7.2﹣4.28+2.8﹣0.72
③53.4÷[1÷(3.1﹣3.09)]
④ ÷ ﹣ ×
⑤ ÷[( + )÷15]
⑥36×0.71+3.6×2.9.
【答案】解:① ×6﹣4÷
= ×6﹣4×
=(6﹣4)×
=2×
= ;
②7.2﹣4.28+2.8﹣0.72
=(7.2+2.8)﹣(4.28+0.72)
=10﹣5
=5;
③53.4÷[1÷(3.1﹣3.09)]
=53.4÷[1÷0.01]
=53.4÷100
=0.534;
④ ÷ ﹣ ×
= × ﹣ ×
= ﹣
= ;
⑤ ÷[( + )÷15]
= ÷[ ÷15]
= ÷ ÷15
= ×
= ;
⑥36×0.71+3.6×2.9
=3.6×7.1+3.6×2.9
=3.6×(7.1+3.9)
=3.6×10
=36.
【解析】①把除法变成乘法,再根据乘法分配律进行计算即可;②根据加法交换律和减法的性质进行计算即可;③先算小括号里的减法,再算中括号里的除法,最后算括号外的除法;④先算除法和乘法,再算减法;⑤先算小括号里的加法,再按照从左到右的顺序计算即可;⑥根据乘法分配律进行计算即可.
六、<b >列算式或方程计算</b>
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