|
(1)1-[1-(
+5 7
÷3 14
)]×3 4
,2 7
=1-[1-(
+5 7
)]×2 7
,2 7
=1-[1-1]×
,2 7
=1-0×
,2 7
=1-0,
=1;
(2)
÷[9 32
-(3 4
+5 16
)],1 4
=
÷[9 32
-3 4
],9 16
=
÷9 32
,3 16
=
;3 2
(3)[5.7-4.8×(480%-3.8)]÷0.45,
=[5.7-4.8×1]÷0.45,
=[5.7-4.8]÷0.45,
=0.9÷0.45,
=2;
(4)
+4987×655-321 666+987×654
÷1 2
,1 4
=
+4987×(654+1)-321 666+987×654
÷1 2
,1 4
=
+4987×654+987-321 666+987×654
÷1 2
,1 4
=
+4987×654+666 666+987×654
÷1 2
,1 4
=1+4
÷1 2
,1 4
=1+18,
=19;
(5)
+1 2004
+2 2004
+…+3 2004
,100 2004
=
,1+2+3+…100 2004
=
,(1+100)×50 2004
=
,5050 2004
=
;2525 1002
(6)(1+
+35 99
+95 33
)÷(15 11
+31 99
+91 33
),1 11
=[(1+3+9)+(
+5 99
+5 33
)]÷[(1+3+9)+(5 11
+1 99
+1 33
),1 11
=[13+
]÷[13+65 99
],13 99
=[13×(1+
)]÷[13×(1+5 99
)],1 99
=(1+
)÷(1+5 99
),1 99
=
÷104 99
,100 99
=
.26 25