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.