问题 解答题
用递等式计算,能简算的要写出简算过程.
(2.5×6+2.5×4)÷535.6-2.8+4.4-7.2
0.25×3.2×12.57.5÷(1.5+2.5)
0.6×(5+0.6)-13.7×1.25-3.7×0.25.
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.

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