问题 解答题

递等式计算(能简算的要简算).

(1)9.76÷3.2×1.6

(2)(8+8)×12.5

(3)7.5×2.3+2.3×3.5-2.3

(4)10.5÷(5.3-4.6)+8.9.

答案

(1)9.76÷3.2×1.6,

=3.05×1.6,

=4.88;

(2)(8+8)×12.5,

=8×12.5+8×12.5,

=100+100,

=200;

(3)7.5×2.3+2.3×3.5-2.3,

=2.3×(7.5+3.5-1),

=2.3×10,

=23;

(4)10.5÷(5.3-4.6)+8.9,

=10.5÷0.7+8.9,

=15+8.9,

=23.9.

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单项选择题