计算,能简便的要简算.(1)7.15+110÷(3.2×2.3)(2)5.6×[10÷(6110−1.8×103)](3)1114÷(364×447−447×294)(4)1+2-3-4+5+6-7-8+9+…+1993(5)58÷[211×(15+16)](6)6÷[1÷(2.1-2.09)].
计算,能简便的要简算.
(1)7.15+110÷(3.2×2.3)
(2)5.6×[10÷(−1.8×)]
(3)÷(×−×)
(4)1+2-3-4+5+6-7-8+9+…+1993
(5)÷[×(+)]
(6)6÷[1÷(2.1-2.09)].
答案和解析
(1)7.15+110÷(3.2×2.3)
=7.15+110÷7
,
=7.15+14,
=22;
(2)5.6×[10÷(−1.8×)]
=5.6×[10÷(6.1-6)],
=5.6×[10÷0.1],
=5.6×100,
=560;
(3)÷(×−×)
=÷[(-)×],
=÷[×],
=÷11,
=;
(4)1+2-3-4+5+6-7-8+9+…+1993
=(1+2-3-4)+(5+6-7-8)+9+…+(1989+1990-1991-1992)+1993,
=-4×498+1993,
=-1992+1993,
=1;
(5)÷[×(+)]
=÷[×],
=÷,
=9;
(6)6÷[1÷(2.1-2.09)]
=6÷[1÷0.01],
=6÷100,
=0.06.
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