下面各题,怎样算简便就怎样算. 1485+290÷58×16 34.25-1.72-2 (2.8+3.85÷3.5)×4.6 24×
下面各题,怎样算简便就怎样算.1485+290÷58×1634.25-1.72-2(2.8+3.85÷3.5)×4.624×15+76÷5(23-25)÷(18+512)...
下面各题,怎样算简便就怎样算. 1485+290÷58×16 34.25-1.72-2 (2.8+3.85÷3.5)×4.6 24× 1 5 +76÷5 ( 2 3 - 2 5 )÷( 1 8 + 5 12 ) 30÷[( 1 4 + 2 7 )× 7 20 ] .
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(1)1485+290÷58×16, =1485+5×16, =1485+80, =1565; (2)34.25-1.72-2, =32.53-2, =30.53; (3)(2.8+3.85÷3.5)×4.6, =(2.8+1.1)×4.6, =3.9×4.6, =17.94; (4)24×
=24×
=(24+76)×
=100×
=20; (5) (
=
=
=
(6)30÷[(
=30÷[
=30÷
=160. |
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