脱式计算(能简便的要简便). 0.233-(0.133-5/7)+2/7 4.62+9.9+5.38+0.1 4×0.6+0.6÷1/4 0.38×7-19/50+4×19/50 36×(4/9-5/12)+15 (1/19+1/23)×2
问题描述:
脱式计算(能简便的要简便).
0.233-(0.133-
|
4.62+9.9+5.38+0.1 | 4×0.6+0.6÷
|
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0.38×7-
|
36×(
|
(
|
答
(1)0.233-(0.133-
)+5 7
,2 7
=0.233-0.133+
+5 7
,2 7
=(0.233-0.133)+(
+5 7
),2 7
=0.1+1,
=1.1;
(2)4.62+9.9+5.38+0.1,
=(4.62+5.38)+(0.1+9.9),
=10+10,
=20;
(3)4×0.6+0.6÷
,1 4
=4×0.6+0.6×4,
=0.6×(4+4),
=0.6×8,
=4.8;
(4)0.38×7-
+4×19 50
,19 50
=
×7-19 50
+4×19 50
,19 50
=
×(7-4+1),19 50
=
×10,19 50
=
; 19 5
(5)36×(
-4 9
)+15,5 12
=36×
-36×4 9
+15,5 12
=16-15+15,
=16;
(6)(
+1 19
)×23×19,1 23
=
×23×19+1 19
×23×19,1 23
=23+19,
=42.