你认为怎样算简便就怎样算.24.6+31.79+25.4 3.21-1.O5-1.7 (0.5+0.25)×4 76-2.4÷0.08 4÷[1-

2024-11-06 14:40:01
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回答1:


(1)24.6+31.79+25.4,
=24.6+25.4+31.79,
=50+31.79,
=81.79;

(2)3.21-1.O5-1.7,
=2.19-1.7,
=0.46;

(3)(0.5+0.25)×4,
=0.5×4+0.25×4,
=2+1,
=3;

(4)76-2.4÷0.08,
=76-30,
=46;

(5)4÷[1-(0.8+0.12)],
=4÷[1-0.92],
=4÷0.08;
=50;

(6)2.46×9+9×7.54,
=(2.46+7.54)×9,
=10×9,
=90.