计算下列各题,能简便的要简便计算 3
(
(9.6-10
5.66×7.28-3.16×3.16-3.16×4.12 2012×0.875+201.2×1.25
|
(1)3
÷(1+1 6
×11 3
),3 4
=3
÷(1+1 6
×1 3
),7 4
=3
÷(1+1 6
),7 12
=
÷19 6
,19 12
=
×19 6
,12 19
=2;
(2)(
+1 15
)×15×17,2 17
=
×15×17+1 15
×15×17,2 17
=17+30,
=47;
(3)(9.6-10
÷1.25)÷(11 2
×0.75),1 3
=(9.6-
÷21 2
)÷(5 4
×4 3
),3 4
=(9.6-
×21 2
)÷1,4 5
=(9.6-8.4)÷1,
=1.2;
(4)5.66×7.28-3.16×3.16-3.16×4.12,
=5.66×7.28-3.16×(3.16+4.12),
=5.66×7.28-3.16×7.28,
=(5.66-3.16)×7.28,
=2.5×7.28,
=18.2;
(5)2012×0.875+201.2×1.25,
=2012×0.875+2012×0.125,
=2012×(0.875+0.125),
=2012×1,
=2012;
(6)
+1 1×2
+1 2×3
+…+1 3×4
,1 99×100
=1-
+1 2
-1 2
+1 3
-1 3
+…+1 4
-1 99
,1 100
=1-
,1 100
=
.99 100