计算下列各题,能简便的要简便计算 3 1 6 ÷(1+ 1 3 ×1 3 4 ) ( 1
计算下列各题,能简便的要简便计算316÷(1+13×134)(115+217)×15×17(9.6-1012÷1.25)÷(113×0.75)5.66×7.28-3.16...
计算下列各题,能简便的要简便计算 3 1 6 ÷(1+ 1 3 ×1 3 4 ) ( 1 15 + 2 17 )×15×17 (9.6-10 1 2 ÷1.25)÷(1 1 3 ×0.75) 5.66×7.28-3.16×3.16-3.16×4.122012×0.875+201.2×1.25 1 1×2 + 1 2×3 + 1 3×4 +…+ 1 99×100 .
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(1)3 ÷(1+ ×1 ), =3 ÷(1+ × ), =3 ÷(1+ ), = ÷ , = × , =2;
(2)( + )×15×17, = ×15×17+ ×15×17, =17+30, =47;
(3)(9.6-10 ÷1.25)÷(1 ×0.75), =(9.6- ÷ )÷( × ), =(9.6- × )÷1, =(9.6-8.4)÷1, =1.2;
(4)5.66×7.28-3.16×3.16-3.16×4.12, =5.66×7.28-3.16×(3.16+4.12), =5.66×7.28-3.16×7.28, =(5.66-3.16)×7.28, =2.5×7.28, =18.2;
(5)2012×0.875+201.2×1.25, =2012×0.875+2012×0.125, =2012×(0.875+0.125), =2012×1, =2012;
(6) + + +…+ , =1- + - + - +…+ - , =1- , = . |
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