用递等式计算:(怎样简便就怎样算)
(1)2÷﹣
÷2;
(2)4×0.75+
×7.25;
(3)﹣0.75×
;
(4)5﹣(3÷0.7×
+
);
(5)3﹣(0.2+
)×4.5;
(6)×[(2.75﹣1.5)÷
+2
].
用递等式计算:(怎样简便就怎样算)
(1)2÷﹣
÷2;
(2)4×0.75+
×7.25;
(3)﹣0.75×
;
(4)5﹣(3÷0.7×
+
);
(5)3﹣(0.2+
)×4.5;
(6)×[(2.75﹣1.5)÷
+2
].