题目内容

29.23-81÷27×0.35
2.5×12.5×0.8×1.2
5.2÷0.25
89×10.1
0.7×2.8+0.3×7.2
1.8÷3.6×(0.9+1.2)
(1)29.23-81÷27×0.35,
=29.23-3×0.35,
=29.23-1.05,
=28.18;

(2)2.5×12.5×0.8×1.2,
=(2.5×1.2)×(12.5×0.8),
=3×10,
=30;

(3)5.2÷0.25,
=(5+0.2)÷0.25,
=5÷0.25+0.2÷0.25,
=20+0.8,
=20.8;

(4)89×10.1,
=89×(10+0.1),
=890+8.9,
=898.9;

(5)0.7×2.8+0.3×7.2,
=1.96+2.16,
=4.12;

(6)1.8÷3.6×(0.9+1.2),
=1.8÷3.6×2.1,
=0.5×2.1,
=1.05.
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