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1.
0.6 0.6 21
103 30 2.4
2.
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②-----------⑤
③----------①
④----------②
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3.
7.98+2.96+1.02 5.95÷﹙1.2+0.5﹚×5
=7.98+1.02 +2.96 =5.95÷1.7×5
=9+2.96 =3.5×5
=11.96 =17.5
6.32×0.9+6.32×0.1 5.4×[﹙1.3+2.15﹚÷0.5]
=6.32×(0.9+0.1) =5.4×[3.45÷0.5]
=6.32×1 =5.4×6.9
=6.32 =37.26