能簡(jiǎn)算的要簡(jiǎn)算
(1)
4.9÷+3.7÷-1.6÷(2)
40-15×(+)(3)98%×99+(1-1%)×2
(4)
×[-(-0.25)](5)
[-(0.2+)×4.5]÷0.125.
(1)
4.9÷+3.7÷-1.6÷,
=4.9×
+3.7×
-1.6×
,
=(4.9+3.7-1.6)×
,
=(8.6-1.6)×
,
=7×
,
=10;
(2)
40-15×(+),
=40-15×
-15×
,
=40-10-3,
=30-3,
=27;
(3)98%×99+(1-1%)×2,
=98×99%+99%×2,
=(98+2)×99%,
=100×99%,
=99;
(4)
×[-(-0.25)],
=
×[
-
+
],
=
×[1-
],
=
×
,
=
;
(5)
[-(0.2+)×4.5]÷0.125,
=[
-0.2×4.5-
×4.5]÷0.125,
=[
-0.9-1.5]÷0.125,
=1.35÷0.125,
=1.08.
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