选用合适的方法计算:6.02+3.6+1.98 1.29+3.7+2.71+6.3 3.07-0.38-1.62 3.25+1.79-0.59+1.75 7.5
选用合适的方法计算:6.02+3.6+1.981.29+3.7+2.71+6.33.07-0.38-1.623.25+1.79-0.59+1.757.5+4.9-6.11...
选用合适的方法计算:6.02+3.6+1.98 1.29+3.7+2.71+6.3 3.07-0.38-1.62 3.25+1.79-0.59+1.75 7.5+4.9-6.1 14.8+7.9-4.8.
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(1)6.02+3.6+1.98 =6.02+1.98+3.6, =8+3.6, =11.6; (2)1.29+3.7+2.71+6.3 =(1.29+2.71)+(3.7+6.3), =4+10, =14; (3)3.07-0.38-1.62 =3.07-(0.38+1.62), =3.07-2, =1.07; (4)3.25+1.79-0.59+1.75 =(3.25+1.75)+(1.79-0.59), =5+1.2, =6.2; (5)7.5+4.9-6.1 =12.4-6.1, =6.3; (6)14.8+7.9-4.8 =14.8-4.8+7.9, =10+7.9 =17.9. |
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