①10.1×87

②6.3+0.84+3.7+8.16

③9.83×1.5+6.17×1.5

④0.8×630×0.125．

2.4+5.7{#blank#}1{#/blank#}5.7+2.4       52.1+72.1-43.65{#blank#}2{#/blank#}43.65+(72.1-52.1)

12.34-2.9{#blank#}3{#/blank#}5.73+4.1    35.6+4.6+7.01{#blank#}4{#/blank#}35.6+4.4+7.21

①32+6.4+68+3.6

②10.27+0.4-8.27

③18.51-9.03-0.97

④64.3-18.75+15.7-11.25

⑤7.41-(2.96+3.04)

⑥4.28+2.08+3.62

①24.75-4.96-6.75

②[180+19×（106+74）]÷60

③87×47+53×87

④32×25

⑤12.64-（2.75+7.64）

7.8+a=a+

n+(m+y)=(+)+y

(a×4)×25=×(×)

n÷12.5÷8=÷(×)

68×a+b×=(+)×68