问题
解答题
递等式计算(能巧则巧)
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答案
(1)9.9×1.01,
=9.9×(1+0.01),
=9.9+0.099,
=9.999;
(2)7.8÷1.25×8,
=6.24×8,
=49.92;
(3)0.25×(12-3.96÷18),
=0.25×(12-0.22),
=0.25×12-0.25×0.22,
=0.25×4×3-0.25×4×0.055,
=3-0.055,
=2.945;
(4)0.24×15÷(3.25-2.35),
=0.24×15÷0.9,
=3.6÷0.9,
=4;
(5)3.4×7.5+7.5×7.6-7.5,
=(3.4+7.6-1)×7.5,
=10×7.5,
=75.