用递等式计算,能简便的要用简便方法计算,写出必要的计算过程 7280-280×12 1650-78-222+350 1230÷
用递等式计算,能简便的要用简便方法计算,写出必要的计算过程7280-280×121650-78-222+3501230÷6+15×1341×(982+760÷38)147...
用递等式计算,能简便的要用简便方法计算,写出必要的计算过程 7280-280×12 1650-78-222+350 1230÷6+15×13 41×(982+760÷38) 1472÷[﹙2100-1364﹚÷23].
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(1)7280-280×12,
=7280-3360,
=3920;
(2)1650-78-222+350,
=(1650+350)-(78+222),
=2000-300,
=1700;
(3)1230÷6+15×13,
=205+195,
=400,;
(4)41×(982+760÷38),
=41×(982+20),
=41×1002,
=41082;
(5)1472÷[﹙2100-1364﹚÷23],
=1472÷[736÷23],
=1472÷32,
=46;
=7280-3360,
=3920;
(2)1650-78-222+350,
=(1650+350)-(78+222),
=2000-300,
=1700;
(3)1230÷6+15×13,
=205+195,
=400,;
(4)41×(982+760÷38),
=41×(982+20),
=41×1002,
=41082;
(5)1472÷[﹙2100-1364﹚÷23],
=1472÷[736÷23],
=1472÷32,
=46;
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