计算(能简便计算的要用简便方法计算)34×(43-89)=1÷[(16+13)÷4]0.25×0.07×86.8×10.7-0.7×6.8

2025-02-25 09:51:39
推荐回答(1个)
回答1:

(1)
3
4
×(
4
3
-
8
9

=
3
4
×
4
3
-
3
4
×
8
9

=1-
2
3

=
1
3


(2)1÷[(
1
6
+
1
3
)÷4]
=1÷[
1
2
÷4]
=1÷
1
8

=8;

(3)0.25×0.07×8
=0.25×8×0.07
=2×0.07
=0.14;

(4)6.8×10.7-0.7×6.8
=6.8×(10.7-0.7)
=6.8×10
=68.