简便计算7.8乘3.04+5.96乘7.8+7.8 0.9999乘0.9+0.1111乘1.986.4除6.4-0.4 5.6乘1.25 13.7乘0.25-3.7除4

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简便计算7.8乘3.04+5.96乘7.8+7.8 0.9999乘0.9+0.1111乘1.986.4除6.4-0.4 5.6乘1.25 13.7乘0.25-3.7除4
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简便计算7.8乘3.04+5.96乘7.8+7.8 0.9999乘0.9+0.1111乘1.986.4除6.4-0.4 5.6乘1.25 13.7乘0.25-3.7除4
简便计算7.8乘3.04+5.96乘7.8+7.8 0.9999乘0.9+0.1111乘1.9
86.4除6.4-0.4 5.6乘1.25 13.7乘0.25-3.7除4

简便计算7.8乘3.04+5.96乘7.8+7.8 0.9999乘0.9+0.1111乘1.986.4除6.4-0.4 5.6乘1.25 13.7乘0.25-3.7除4
7.8×3.04+5.96×7.8+7.8
=7.8×(3.04+5.96+1)
=7.8×10
=78
0.9999×0.9+0.1111×1.9
=0.1111×8.1+0.1111×1.9
=0.1111×(8.1+1.9)
=0.1111×10
=1.111
86.4÷6.4-0.4
=86.4÷1.6÷4-0.4
=54÷4-0.4
=13.5-0.4
=13.1
5.6×1.25
=0.7×(8×1.25)
=0.7×10
=7
13.7×0.25-3.7÷4
=13.7×1/4-3.7×1/4
=(13.7-3.7)×1/4
=10×1/4
=2.5