问题
解答题
用递等式计算,能简算的要写出简算过程.
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答案
(1)(2.5×6+2.5×4)÷5,
=2.5×(6+4)÷5,
=2.5×10÷5,
=25÷5,
=5;
(2)35.6-2.8+4.4-7.2,
=(35.6+4.4)-(2.8+7.2),
=40-10,
=30;
(3)0.25×3.2×12.5,
=0.25×4×0.8×12.5,
=(0.25×4)×(0.8×12.5),
=1×10,
=10;
(4)7.5÷(1.5+2.5),
=7.5÷4,
=1.875;
(5)0.6×(5+0.6)-1,
=0.6×5+0.6×0.6-1,
=3+0.36-1,
=3.36-1,
=2.36;
(6)3.7×1.25-3.7×0.25,
=3.7×(1.25-0.25),
=3.7×1,
=3.7.