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计算下面各题.530+48×4÷24(420-42×7)÷63630÷(21-12)×163.65×[(4.2+2.8)÷0.05]8.6×[(40.75-9.5)×0.4].

题目详情
计算下面各题.
530+48×4÷24     
(420-42×7)÷63          
630÷(21-12)×16
3.65×[(4.2+2.8)÷0.05]
8.6×[(40.75-9.5)×0.4].
计算下面各题.
530+48×4÷24     
(420-42×7)÷63          
630÷(21-12)×16
3.65×[(4.2+2.8)÷0.05]
8.6×[(40.75-9.5)×0.4].





▼优质解答
答案和解析
(1)530+48×4÷24     
=530+192÷24
=530+8
=538

(2)(420-42×7)÷63     
=(420-294)÷63
=126÷63
=2
     
(3)630÷(21-12)×16
=630÷9×16
=70×16
=1120

(4)3.65×[(4.2+2.8)÷0.05]
=3.65×[7÷0.05]
=3.65×140
=511

(5)8.6×[(40.75-9.5)×0.4]
=8.6×[31.25×0.4]
=8.6×12.5
=107.5