计算,能简算的要简算.
①56×(+-) ②8.32×101-8.32③6.75-+3.25-④÷[×(+)]⑤(-)÷(+) ⑥(+25%)÷+0.7.
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解:①56×(+-)
=56×+56×+56×
=32+35+42
=109;
②8.32×101-8.32
=8.32×(101-1)
=8.32×100
=832;
③6.75-+3.25-
=6.75+3.25-(+2)
=10-4
=6;
④÷[×(+)]
=[×+]
=÷[+]
=÷
=×3
=
⑤(-)÷(+)
=÷
=×
=;
⑥(+25%)÷+0.7
=(+)×+0.7
=×+0.7
=0.45+0.7
=1.15.
解析分析:按计算顺序计算:有括号的先算括号内的,没括号的,先算乘除后算加减.能用运算规律(如乘法分配律,加法结合律等)的,可以用规律简算.
点评:按计算顺序计算,能利用规律简算的,可以利用规律简算.