试题:
用递等式计算。
(1)(+)×15 (2)300-180÷15×6 (3)(3.8-1.8÷2)×0.3
(4)÷9+× (5)32.4×0.45+5.5×3.24

答案:

我来补答
(1)原式=×15+×15
                =10+12
                =22
(2)原式=300-12×6
                =300-72
                =28
(3)原式=(3.8-0.9)÷0.3
                =2.9÷0.3
                =0.87
(4)原式=×(+
                =
(5)原式=32.4×(0.45+0.55)
                =32.4
 
 
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