脱式计算.(能简算的要简算) 0.125×0.25×8×4 [5-1.7÷(2-1)]×1 87×386 49÷(79+49)×114
脱式计算.(能简算的要简算)0.125×0.25×8×4[5-1.7÷(2-1)]×187×38649÷(79+49)×1143.9÷1.5-2.3×0.5112÷34-...
脱式计算.(能简算的要简算) 0.125×0.25×8×4 [5-1.7÷(2-1)]×1 87×386 49÷(79+49)×114 3.9÷1.5-2.3×0.5 112÷34-58×1635.
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(1)0.125×0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;
(2)[5-1.7÷(2-1)]×1,
=[5-1.7÷1]×1,
=[5-1.7]×1,
=3.3×1,
=3.3;
(3)87×
,
=(86+1)×
,
=86×
+1×
,
=3+
,
=3
;
(4)
÷(
+
)×
,
=
÷
×
,
=
×
,
=1;
(5)3.9÷1.5-2.3×0.5,
=2.6-1.15,
=1.45;
(6)1
÷
-
×
,
=2-
,
=1
.
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