问题
解答题
用递等式计算. ①[1-(
②(
③7.5×4.7+4.7×2.5 ④25.3×12-33.46÷0.35 ⑤
⑥
|
答案
①[1-(
+1 8
)]×36,2 3
=[1-(
+3 24
)]×36,16 24
=[1-
]×36,19 24
=
×36,5 24
=
;15 2
②(
+2 9
)×36,7 12
=36×
+2 9
×36,7 12
=8+21,
=29;
③7.5×4.7+4.7×2.5,
=4.7×(7.5+2.5),
=4.7×10,
=47;
④25.3×12-33.46÷0.35,
=303.6-95.6,
=208;
⑤
×[5 6
÷(1-2 3
)],13 15
=
×[5 6
÷2 3
],2 15
=
×[5 6
×2 3
],15 2
=
×5,5 6
=4
;1 6
⑥
+(1 4
-5 8
)÷3 10
,1 2
=
+(1 4
-25 40
)×2,12 40
=
+1 4
×2,13 40
=
+5 20
,13 20
=
.9 10