计算下面各题,能简算的要简算.(1)b一×3b×1.b一(b)713×b17+613÷17b(3)b3÷(1-一口)(4)1b+
计算下面各题,能简算的要简算.(1)b一×3b×1.b一(b)713×b17+613÷17b(3)b3÷(1-一口)(4)1b+13-1b+13(一)1.口×(一.7-3...
计算下面各题,能简算的要简算.(1)b一×3b×1.b一(b)713×b17+613÷17b(3)b3÷(1-一口)(4)1b+13-1b+13(一)1.口×(一.7-3.44÷0.口)(6)0.3×b÷0.3×b.
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2014-11-08
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(6)25×32×6.25,
=25×4×8×6.25,
=(25×4)×(8×6.25),
=666×66,
=6666;
(2)
×
+
÷
,
=
×
+
×
,
=
×(
+),
=
×6,
=
;
(3)
÷(6-
),
=
÷
,
=
;
(4)
+
-
+
,
=(
-
)+(
+),
=6+
,
=
;
(5)6.8×(5.7-3.44÷6.8),
=6.8×(5.7-4.3),
=6.8×6.4,
=2.52;
(它)6.3×2÷6.3×2,
=(6.3÷6.3)×(2×2),
=6×4,
=4.
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