19+2.4+2.91+14.635×153-0.6×5380.7×8.7+8.07×13.(710+56+45)×3021÷(13+25)÷91145÷[(58-12)÷58].-数学
题文
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答案
(1)19+2.4+2.91+14.6, =(19+2.91)+(2.4+14.6), =21.91+17, =38.91; (2)
=0.6×153-0.6×53, =(153-53)×0.6, =100×0.6, =60; (3)80.7×8.7+8.07×13, =8.07×87+8.07×13, =(87+13)×8.07, =100×8.07, =807; (4)(
=
=21+25+24, =70; (5)21÷(
=21÷
=21×
=35; (6)
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