下面各题,怎样算简便就怎样算.①1485+290÷58×16 ②34.25-1.72-2.28&...
下面各题,怎样算简便就怎样算.①1485+290÷58×16②34.25-1.72-2.28③(2.8+3.85÷3.5)×4.6④24×15+76÷5⑤(23()()2...
下面各题,怎样算简便就怎样算.①1485+290÷58×16 ②34.25-1.72-2.28 ③( 2.8+3.85÷3.5 )×4.6④24×15+76÷5⑤( 23( )( )25 )÷( 18+512 )⑥30÷[( 14+27 )×720].
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潇潇Nr
推荐于2016-05-08
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①1485+290÷58×16
=1485+5×16
=1485+80
=1565;
②34.25-1.72-2.28
=34.25-(1.72+2.28)
=34.25-4
=30.25;
③(2.8+3.85÷3.5)×4.6
=(2.8+1.1)×4.6
=3.9×4.6
=17.94;
④
24×+76÷5=24×
+76×
=(24+76)×
=100×
=20;
⑤(
-
)÷(
+
)
=
÷
=
;
⑥
30÷[( + )×]=30÷[
×
]
=30÷
=160.
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