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用递等式计算(能简算要简算)3.6+2.7+6.4;15-3.28-1.72;6.08-1.5+0.92;4.6-(1.45+2.15).

题目详情
用递等式计算(能简算要简算)
3.6+2.7+6.4;       15-3.28-1.72;        6.08-1.5+0.92;        4.6-(1.45+2.15).
▼优质解答
答案和解析
(1)3.6+2.7+6.4
=(3.6+6.4)+2.7
=10+2.7
=12.7;

(2)15-3.28-1.72
=15-(3.28+1.72)
=15-5
=10;

(3)6.08-1.5+0.92
=6.08+0.92-1.5
=7-1.5
=5.5;

(4)4.6-(1.45+2.15)
=4.6-3.6
=1.