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(1)7÷10=0.7;
所以,7分米=0.7米;
(2)70÷1000=0.07;
0.07+7=7.07;
所以,7千米70米=7.07千米;
(3)51÷1000=0.051;
所以,51克=0.051千克;
(4)1÷10=0.1;
6÷100=0.06;
0.1+0.06+30=30.16;
所以,30元1角6分=30.16元.
故答案为:0.7,7.07,0.051,30.16.
(1)7÷10=0.7;
所以,7分米=0.7米;
(2)70÷1000=0.07;
0.07+7=7.07;
所以,7千米70米=7.07千米;
(3)51÷1000=0.051;
所以,51克=0.051千克;
(4)1÷10=0.1;
6÷100=0.06;
0.1+0.06+30=30.16;
所以,30元1角6分=30.16元.
故答案为:0.7,7.07,0.051,30.16.