递等式计算(能简算的要简算)18.08-(1.08+ 7 9 )- 2 9 79 4 9
递等式计算(能简算的要简算)18.08-(1.08+79)-297949×0.875+79÷1.612.4-2.4÷415÷2.54.2÷[25×(2.8-1.05)](...
递等式计算(能简算的要简算)18.08-(1.08+ 7 9 )- 2 9 79 4 9 ×0.875+ 7 9 ÷1.6 12.4-2.4÷ 4 15 ÷2.5 4.2÷[ 2 5 ×(2.8-1.05)] (3.6×0.75×1.2)÷(1.5×24×0.18) 3 10 + 3 40 + 3 88 + 3 154 .
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(1)18.08-(1.08+ )- =18.08-1.08- - , =17-( + ), =17-1, =16;
(2)79 ×0.875+ ÷1.6 =(80- )× + ÷ , =80× - × + × , =70-( × - × ), =70-0, =70;
(3)12.4-2.4÷ ÷2.5 =12.4-2.4× ÷2.5, =12.4-0.6×15÷2.5, =12.4-3.6, =8.8;
(4)4.2÷[ ×(2.8-1.05)] =4.2÷[ ×1.75], =4.2÷0.7, =6;
(5)(3.6×0.75×1.2)÷(1.5×24×0.18) =3.6×0.75×1.2÷1.5÷24÷0.18, =(3.6÷0.18)×(0.75÷1.5)×(1.2÷24), =20×0.5×0.05, =0.5;
(6) + + + = + + + , = - + - + - + - , = - , = - , = . |
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