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用递等式计算(写出必要的计算过程,能简便用简便方法计算)

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用递等式计算(写出必要的计算过程,能简便用简便方法计算)
(1)45.07+(4.93+8.62)
(2)12.5×(80+0.8)
(3)34.26+47.7-55.3+2.53
(4)13.2-180÷45×2.6
(5)4.7×2.4+0.47×58+0.18×47
(6)8.9+30.1÷[(5.04+3.56)×0.7].
用递等式计算(写出必要的计算过程,能简便用简便方法计算)
(1)45.07+(4.93+8.62),
=45.07+13.55,
=58.62;

(2)12.5×(80+0.8),
=12.5×80+12.5×0.8,
=1000+10,
=1010;

(3)34.26+47.7-55.3+2.53,
=34.26+(47.7+2.53)-55.3,
=34.26+50.23-55.3,
=84.49-55.3,
=29.19;

(4)13.2-180÷45×2.6,
=13.2-4×2.6,
=13.2-10.4,
=2.8;

(5)4.7×2.4+0.47×58+0.18×47,
=4.7×2.4+4.7×5.8+1.8×4.7,
=4.7×(2.4+5.8+1.8),
=4.7×10,
=47;

(6)8.9+30.1÷[(5.04+3.56)×0.7],
=8.9+30.1÷[8.6×0.7],
=8.9+30.1÷6.02,
=8.9+5,
=13.9.