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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
+1.29)
2700-780÷26×34
1.25×32×2.5
×45-
÷
.
3.29-(1
1 |
3 |
2700-780÷26×34
1.25×32×2.5
7 |
16 |
7 |
16 |
1 |
45 |
▼优质解答
答案和解析
(1)3.29-(1
+1.29),
=3.29-1.29-1
,
=2-1
,
=
;
(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)
×45-
÷
,
=
×45-
×45,
=(
-
)×45,
=0×45,
=0.
1 |
3 |
=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 |
7 |
16 |
1 |
45 |
=
7 |
16 |
7 |
16 |
=(
7 |
16 |
7 |
16 |
=0×45,
=0.
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