问题 解答题

怎样简便就怎样计算:

2.9×1.4+2×0.16

5.4×2.08+66×0.208-2.08

30.8÷[14-(9.85+1.07)]

[(12.5+1.25+0.125)×80-999]÷0.03.

答案

(1)2.9×1.4+2×0.16

=4.06+0.32,

=4.38;

(2)5.4×2.08+66×0.208-2.08

=5.4×2.08+6.6×2.08-2.08,

=(5.4+6.6-1)×2.08,

=11×2.08,

=22.88;

(3)30.8÷[14-(9.85+1.07)]

=30.8÷[14-10.92]

=30.8÷3.08,

=10;

(4)[(12.5+1.25+0.125)×80-999]÷0.03

=[(12.5×80+1.25×80+0.125×80)-999]÷0.03,

=[(1000+100+10)-999]÷0.03,

=[1110-999]÷0.03,

=111÷0.03,

=3700.

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