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计算。24.7-11-91-0.125÷84×0.25+×16(2.5+3.6)×2+3.9×20.875×+0.125÷2-30%×0.2÷50%

题目详情
计算。
24.7-11 -9 1-0.125÷
84×0.25+ ×16 (2.5+3.6)×2 +3.9×2
0.875× +0.125÷2 -30%×0.2÷50%
▼优质解答
答案和解析
①24.7-11 -9
=24.7-(11 +9 ),
=24.7-20
=4
②1-0.125÷
=1-0.125÷0.125,
=1-1,
=0;
③84×0.25+ ×16,
=84×0.25+0.25×16,
=0.25×(84+16),
=0.25×100,
=25;
④(2.5+3.6)×2 +3.9×2
=2 ×(2.5+3.6+3.9),
= ×10,
=22.5;
⑤0.875× +0.125÷2,
=0.875× +0.125×
= ×(0.875+0.125),
= ×1,
=
-30%×0.2÷50%,
=0.5-0.3×0.2÷0.5,
=0.5-0.12,
=0.38