452÷20+109×43=101×92-92=907×99+907=274+299+201+326=6.5×99+6.5=31.25÷25×0.5=3.8×4.2+38×0.58=13-78+18=(12+13+16)×2×3×4=37×(45-23)÷315=36÷[(56-23)×3]=18÷(14+-数学
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答案
(1)452÷20+109×43 =22.6+4687, =4709.6; (2)101×92-92, =(101-1)×92, =100×92, =9200; (3)907×99+907, =(99+1)×907, =100×907, =90700; (4)274+299+201+326, =(274+326)+(299+201), =600+500, =1100; (5)6.5×99+6.5, =(99+1)×6.5, =100×6.5, =650; (6)31.25÷25×0.5, =1.25÷0.5, =2.5; (7)3.8×4.2+38×0.58 =38×0.42+38×0.58 =(0.42+0.58)×38, =1×0.38, =38; (8)13-
=12
=12
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