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脱式计算.100÷25+50×151.5÷3-1.2×0.4615-(35+2.4×13)÷121.2+[225÷(2-2.4×23)].

题目详情
脱式计算.
100÷25+50×15            
1.5÷3-1.2×0.4
6
1
5
-(
3
5
+2.4×
1
3
)÷
1
2

1.2+[2
2
5
÷(2-2.4×
2
3
)].
▼优质解答
答案和解析
(1)100÷25+50×15
=4+750
=754;

(2)1.5÷3-1.2×0.4
=0.5-0.48
=0.02;

(3)6
1
5
-(
3
5
+2.4×
1
3
)÷
1
2

=6
1
5
-(
3
5
+0.8)÷
1
2

=6
1
5
-1.4÷
1
2

=6
1
5
-2.8
=3.4;

(4)1.2+[2
2
5
÷(2-2.4×
2
3
)]
=1.2+[2
2
5
÷(2-1.6)]
=1.2+[2
2
5
÷0.4]
=1.2+6
=7.2.