能用简便方法计算的用简便方法计算．78-1.46+1.54；18.5-3.21-4.79；3.72×9.9；4.5×0.7+5.5×0.7；0.4×（2.5+0.25）；82.4-12.4×5；14.2×9.9+1.42；4.8+3.72+4.2+16.28．

Question

能用简便方法计算的用简便方法计算．

78-1.46+1.54；	18.5-3.21-4.79；
3.72×9.9；	4.5×0.7+5.5×0.7；
0.4×（ 2.5+0.25 ）；	82.4-12.4×5；
14.2×9.9+1.42；	4.8+3.72+4.2+16.28．

Answer 1

①78-1.46+1.54
=76.54+1.54
=78.08
②18.5-3.21-4.79
=18.5-（3.21+4.79）
=18.5-7
=11.5
③3.72×9
=3.72×（10-1）
=37.2-3.72
=33.48
④4.5×0.7+5.5×0.7
=（4.5+5.5）×0.7
=10×0.7
=7
⑤0.4×（ 2.5+0.25 ）
=0.4×2.5+0.25×0.4
=1+0.1
=1.1
⑥82.4-12.4×5
=82.4-62
=20.4
⑦14.2×9.9+1.42
=1.42×99+1.42
=1.42×100
=142
⑧4.8+3.72+4.2+16.28
=（4.8+4.2）+（16.28+3.72）
=9+20
=29