0.64－0.27=（   ）

- =         8÷0.4＝          - ＝

+ ＝        - ＝          7-6.38＝

+ ＝          + ＝          0.22×0.5＝

2.56{#blank#}1{#/blank#}25.6      26.81-12.99{#blank#}2{#/blank#}12.82     25×16{#blank#}3{#/blank#}16×25

1.05{#blank#}4{#/blank#}1.5     8.66+17.34{#blank#}5{#/blank#}25.9     416-277-23{#blank#}6{#/blank#}416-277+23

9.8+6.52=                      23.4-9.4+0.6=        

7－4.68=                        20.9－（3.7－2.7）=

8.5+5.5-5.5=                100－15×2=

13－5.42－2.58=           90÷3×3=