买玩具。10元2角，7元8角，8元2角

买玩具。/M7t8V9o*h'A9}6k2V/s)X7Q

10元2角，    7元8角，   8元2角，   6元。/M7t8V9o*h'A9}6k2V/s)X7Q

（1）和一共要用0]+_.g5],|元0y*r)k0Z:O9c+}4b8o5s角。/M7t8V9o*h'A9}6k2V/s)X7Q

（2）付10元钱买，应找回7u*W2{'L7a元5i-P2@1i1k7X:Q(v/y1E角。/M7t8V9o*h'A9}6k2V/s)X7Q

（3）付20元买一个和一个，应找回'A.Z.F8l0s元。/M7t8V9o*h'A9}6k2V/s)X7Q