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脱式计算(70.2×0.6-2.12)÷70(34-13+56)×123.5×37+5.5×80%+0.820.07×1994-19.93×200736.25-(19.8-3.75)-4.2.

题目详情
脱式计算
(70.2×0.6-2.12)÷70
3
4
-
1
3
+
5
6
)×12
3.5×
3
7
+5.5×80%+0.8
20.07×1994-19.93×2007
36.25-(19.8-3.75)-4.2.
▼优质解答
答案和解析
(1)(70.2×0.6-2.12)÷70
=(42.12-2.12)÷70
=40÷70
=
4
7


(2)(
3
4
-
1
3
+
5
6
)×12
=
3
4
×12-
1
3
×12+
5
6
×12
=9-4+10
=15

(3)3.5×
3
7
+5.5×80%+0.8
=1.5+4.4+0.8
=6.7

(4)20.07×1994-19.93×2007
=2007×19.94-19.93×2007
=2007×(19.94-19.93)
=2007×0.01
=20.07

(5)36.25-(19.8-3.75)-4.2
=36.25-19.8+3.75-4.2
=36.25+3.75-(19.8+4.2)
=40-24
=16