用简便方法计算.4.35+8.6+15.65+1.4 19.32-5.56-3.44 37.6-(7.6+3.25) 5.49+2.68-3.49 6.27+3.83+1.73
用简便方法计算.4.35+8.6+15.65+1.419.32-5.56-3.4437.6-(7.6+3.25)5.49+2.68-3.496.27+3.83+1.738...
用简便方法计算.4.35+8.6+15.65+1.4 19.32-5.56-3.44 37.6-(7.6+3.25) 5.49+2.68-3.49 6.27+3.83+1.73 8.4+3.5-8.4+3.5.
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(1)4.35+8.6+15.65+1.4 =(4.35+15.65)+(8.6+1.4), =20+10, =30; (2)19.32-5.56-3.44 =19.32-(5.56+3.44), =19.32-9, =10.32; (3)37.6-(7.6+3.25) =37.6-7.6-3.25, =30-3.25, =26.75; (4)5.49+2.68-3.49 =5.49-3.49+2.68, =2+2.68, =4.68; (5)6.27+3.83+1.73 =6.27+1.73+3.83, =8+3.83, =11.83; (6)8.4+3.5-8.4+3.5 =8.4-8.4+(3.5+3.5), =0+7, =7. |
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