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21 0.8

/21,就是 1111 1111.1111 1111.1111 1000.0000 0000, 即255.255.248.0

16.8

0.25×21×0.8 =0.25×0.8×21 =0.2×21 =4.2

1.21x 21×0.8 =25.41×0.8 =20.328

21.36/2.9*0.8=77.43

0.15+0.8x0.21=0.15+0.168=0.318

21.36÷0.8-12.9 =213.6÷8-12.9 =26.7-13+0.1 =13.8

21.36÷0.8-12.9 =26.7-12.9 =13.8 这是一道小数除法的混合运算

=21.36/0.8-12.9=213.6/8-12.9=26.7-12.9=13.8

77.43

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