用你喜欢的方法计算.(1)83.72-(75-16.28)(2)1998+199.8+19.98+1.998+2.222(3)[4.8-4.8×(3.2-2
用你喜欢的方法计算.(1)83.72-(75-16.28)(2)1998+199.8+19.98+1.998+2.222(3)[4.8-4.8×(3.2-2.7)]÷0....
用你喜欢的方法计算.(1)83.72-(75-16.28)(2)1998+199.8+19.98+1.998+2.222(3)[4.8-4.8×(3.2-2.7)]÷0.24 (4)(18.87+18.87+18.87+18.87)×2.5.
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(1)83.72-(75-16.28),
=83.72-75+16.28,
=(83.72+16.28)-75,
=100-75,
=25;
(2)1998+199.8+19.98+1.998+2.222,
=(2000-2)+(200-0.2)+(20-0.02)+(2-0.002)+2.222,
=2222-2.222+2.222,
=2222;
(3)[4.8-4.8×(3.2-2.7)]÷0.24,
=[4.8-4.8×0.5]÷0.24,
=[4.8-2.4]÷0.24,
=2.4÷0.24,
=10;
(4)(18.87+18.87+18.87+18.87)×2.5,
=18.87×4×25,
=18.87×(4×25),
=18.87×100,
=1887.
=83.72-75+16.28,
=(83.72+16.28)-75,
=100-75,
=25;
(2)1998+199.8+19.98+1.998+2.222,
=(2000-2)+(200-0.2)+(20-0.02)+(2-0.002)+2.222,
=2222-2.222+2.222,
=2222;
(3)[4.8-4.8×(3.2-2.7)]÷0.24,
=[4.8-4.8×0.5]÷0.24,
=[4.8-2.4]÷0.24,
=2.4÷0.24,
=10;
(4)(18.87+18.87+18.87+18.87)×2.5,
=18.87×4×25,
=18.87×(4×25),
=18.87×100,
=1887.
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