128+205+195+72
198+215+285
0.35+0.5=
8-2.8=
10000÷125÷8=
250×9×4=
10.6÷100=
199×50+50=
7.68+3.89-5.68=
9+72÷9×0=
①1700÷25÷4
②273- (273-168)
③241×48-48×116
④19.3+8.26+5.74
⑤15.6-4.13+3.87
⑥810÷[81÷(56-29)]
①15.4-5.44×1.05
②4.75-3.79+11.25-4.21
③49×0.125×8
④0.48×99+0.48
7.237.32
8.408.4
0.610.6001
0.1是1的 ,0.01是1的 。