选择自己喜欢的方法,计算下面各题.12.5÷2.5÷0.4 2.6×1.9÷2.6×1.9&nb...
选择自己喜欢的方法,计算下面各题.12.5÷2.5÷0.42.6×1.9÷2.6×1.9(7.7+1.54)÷0.710.8÷[(4.62-1.92)×4]3.8×6.7...
选择自己喜欢的方法,计算下面各题.12.5÷2.5÷0.4 2.6×1.9÷2.6×1.9 (7.7+1.54)÷0.710.8÷[(4.62-1.92)×4]3.8×6.7+3.3×3.8 1.28×0.29-0.29×0.28
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①12.5÷2.5÷0.4
=12.5÷(2.5×0.4)
=12.5÷1
=1.25;
②2.6×1.9÷2.6×1.9
=(2.6÷2.6)×(1.9×1.9)
=1×3.61
=3.61;
③(7.7+1.54)÷0.7
=9.24÷0.7
=13.2;
④10.8÷[(4.62-1.92)×4]
=10.8÷[2.7×4]
=10.8÷10.8
=1;
⑤3.8×6.7+3.3×3.8
=3.8×(6.7+3.3)
=3.8×10
=38;
⑥1.28×0.29-0.29×0.28
=0.29×(1.28-0.28)
=0.29×1
=0.29.
=12.5÷(2.5×0.4)
=12.5÷1
=1.25;
②2.6×1.9÷2.6×1.9
=(2.6÷2.6)×(1.9×1.9)
=1×3.61
=3.61;
③(7.7+1.54)÷0.7
=9.24÷0.7
=13.2;
④10.8÷[(4.62-1.92)×4]
=10.8÷[2.7×4]
=10.8÷10.8
=1;
⑤3.8×6.7+3.3×3.8
=3.8×(6.7+3.3)
=3.8×10
=38;
⑥1.28×0.29-0.29×0.28
=0.29×(1.28-0.28)
=0.29×1
=0.29.
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