问题
解答题
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答案
(1)3.2+7.5×0.5,
=3.2+3.75,
=6.95;
(2)0.73×50×0.4,
=0.73×(50×0.4),
=0.73×20,
=14.6;
(3)0.9×[13-(4.75+5.25)],
=0.9×[13-10],
=0.9×3,
=2.7;
(4)2.78+59.8+1.22,
=(2.78+1.22)+59.8,
=4+59.8,
=63.8;
(5)9.63×2.5+6.37×2.5,
=(9.63+6.37)×2.5,
=16×2.5,
=40;
(6)(12-1.5÷0.5)×4.2,
=(12-3)×4.2,
=9×4.2,
=37.8.