脱式计算,能简算的要简算
47×2.8+52×2.8+2.837.6-4.87-1.1331-[0.5×(6-5.7)+18].
网友回答
解:(1)3+3+6
=3+6+3
=10+3
=13;
(2)47×2.8+52×2.8+2.8
=2.8×(47+52+1)
=2.8×100
=280;
(3)37.6-4.87-1.13
=37.6-(4.87+1.13)
=37.6-6
=31.6;
(4)31-[0.5×(6-5.7)+18]
=31-[0.5×0.3+18]
=31-18.15
=12.85;
(5)9.3÷[24×(1-)+3.6]
=9.3÷[24×1-24×+3.6]
=9.3÷18.6
=0.5;
(6)[(+)÷-]÷
=[÷-]÷
=[÷-]÷
=[5-]÷
=÷
=3;
故