问题
解答题
用合理的方法计算.
5.6×3
(947
|
答案
(1)
÷[1 16
×(1 25
+2 5
)],1 10
=
÷[1 16
×(1 25
+4 10
)],1 10
=
÷[1 16
×1 25
],1 2
=
÷1 16
,1 50
=
×50,1 16
=
;25 8
(2)5.6×3
-43 4
×3.75+0.88×372 5
,1 2
=5.6×3.75-4.4×3.75+0.88×37.5,
=5.6×3.75-4.4×3.75+8.8×3.75,
=(5.6-4.4+8.8)×3.75,
=10×3.75,
=37.5;
(3)(947
+943 5
+9.476+0.9476)÷0.1111,19 25
=(947.6+94.76+9.476+0.9476)÷0.1111,
=(9476×0.1+9476×0.01+9476×0.001+9476×0.0001)÷0.1111,
=[(0.1+0.01+0.001+0.0001)×9476]÷0.1111,
=0.1111×9476÷0.1111,
=9476;
(4)
,2011×(3.4×69+3.5) 3.5×69-3.4
=
,2011×[3.4×(70-1)+3.5] [(3.4+0.1)×69-3.4]
=
,2011×(3.4×70+0.1) 3.4×69+3.5
=
,2011×(3.4×70+0.1) 3.4×70+0.1
=2011.