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计算,能用简便算法的要用简便方法计算.3.29-(113+1.29)2700-780÷26×341.25×32×2.5716×45-716÷145.

题目详情
计算,能用简便算法的要用简便方法计算.
3.29-(1
1
3
+1.29)
2700-780÷26×34
1.25×32×2.5
7
16
×45-
7
16
÷
1
45
▼优质解答
答案和解析
(1)3.29-(1
1
3
+1.29),
=3.29-1.29-1
1
3

=2-1
1
3

=
2
3


(2)2700-780÷26×34,
=2700-30×34,
=2700-1020,
=1680;

(3)1.25×32×2.5,
=1.25×8×4×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;

(4)
7
16
×45-
7
16
÷
1
45

=
7
16
×45-
7
16
×45,
=(
7
16
-
7
16
)×45,
=0×45,
=0.