1樓:手機使用者
(du1)6.64+0.22+9.78+3.36=(zhi6.64+3.36)dao+(0.22+9.78)=10+10
=20;
回(2)75.1+24.19-75.1+24.19=(75.1-75.1)+(24.19+24.19)=0+48.38
=48.38;
(3)36900÷(2060-1910)+60=36900÷150+60
=246+60
=306;
(4)248×
答6+274÷137
=1488+2
=1490.
脫式計算下面各題(能簡算的要用簡便方法計算,並寫出簡算過程). 450÷18×25+173. 670+65÷
2樓:匿名使用者
(1)450÷18×25+173,
=25×25+173,
=625+173,
=798;
(2)670+65÷3×35,
=670+65×(13×3
5),=670+65×15,
=670+13,
=683;
(3)58-1
6×45+57,=58
-215
+57,
=59120
+57,
=5759
120;
(4)38-12×6÷16,
=38-72÷16,
=38-4.5,
=33.5.
計算.能簡算的要簡算,並寫出簡算過程.(1)(0.12+0.22+0.32+0.42)2÷(0.13+0.23+0.33+0.43)(2)3
3樓:匿名使用者
(1)(0.12+0.22+0.32+0.42)2÷(0.13+0.23+0.33+0.43),
=(0.01+0.04+0.09+0.16)2÷(0.001+0.008+0.027+0.064),
=0.32÷0.1,
=0.09÷0.1,
=0.9;
(2)3.97÷7+1
7×4.03-17,
=3.97×17+1
7×4.03?17,
=(3.97+4.03-1)×17,
=7×17,
=1;(3)0.0021×[16
7+2.93÷(112
3-1.9)]÷0.001,
=0.0021×[16
7+293
100÷923
30]÷0.001,
=0.0021×[16
7+293
100×30
293]÷0.001,
=0.0021×[167+3
10]÷0.001,
=0.0021×151
70÷0.001,
=0.00453÷0.001,
=4.53;
(4)0.125×0.25×0.
5×64,=0.125×0.25×0.
5×8×4×2,=(0.125×8)×(0.25×4)×(0.
5×2),=1×1×1,
=1;(5)4936×(0.75×42.7-0.573×25+57.3)÷3.
=4936×(32.025-14.325+57.3)÷3,=4936×75÷3,
=370200÷3,
=123400.
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