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
1个回答

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