(1)23.3×(2?75)+56×114+(1+25)×28.7(2)(14+2)×113?(225÷0.4+0.2×345)(3)0.01992÷0.004×120
(1)23.3×(2?75)+56×114+(1+25)×28.7(2)(14+2)×113?(225÷0.4+0.2×345)(3)0.01992÷0.004×1200...
(1)23.3×(2?75)+56×114+(1+25)×28.7(2)(14+2)×113?(225÷0.4+0.2×345)(3)0.01992÷0.004×12000(4)[8.6?345×(358?3.625)]÷10.
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(1)23.3×(2?75)+56×1
+(1+25)×28.7
=23.3×(2-0.75)+56×1.25+(1+0.25)×28.7,
=23.3×1.25+56×1.25+1.25×28.7,
=1.25×(23.3+56+28.7)
=1.25×108,
=1.25×(100+8),
=1.25×100+1.25×8,
=135;
(2)(
+2)×1
?(
÷0.4+0.2×3
)
=
×
-(0.08÷0.4+0.2×3.8),
=3-(0.2+0.76),
=3-0.96,
=2.04;
(3)0.01992÷0.004×
=4.98×
,
=0..249;
(4)[8.6?3
×(3
?3.625)]÷10
=[8.6-3
×(3.625-3.625)]÷10,
=(8.6-3
×0)÷10,
=(8.6-0)÷10,
=8.6÷10,.
=0.86.
1 |
4 |
=23.3×(2-0.75)+56×1.25+(1+0.25)×28.7,
=23.3×1.25+56×1.25+1.25×28.7,
=1.25×(23.3+56+28.7)
=1.25×108,
=1.25×(100+8),
=1.25×100+1.25×8,
=135;
(2)(
1 |
4 |
1 |
3 |
2 |
25 |
4 |
5 |
=
9 |
4 |
4 |
3 |
=3-(0.2+0.76),
=3-0.96,
=2.04;
(3)0.01992÷0.004×
1 |
2000 |
=4.98×
1 |
2000 |
=0..249;
(4)[8.6?3
4 |
5 |
5 |
8 |
=[8.6-3
4 |
5 |
=(8.6-3
4 |
5 |
=(8.6-0)÷10,
=8.6÷10,.
=0.86.
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