选用合适的方法计算:6.02+3.6+1.98 1.2...
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.
=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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