1樓:孫叔
(1)2.9+6.46+7.1+3.54,=(2.9+7.1)+(6.46+3.54),=10+10,
=20;
(2)2.3÷8÷12.5,
=2.3÷(8×12.5),
=2.3÷100,
=0.023;
(3)0.4×(25+2.5),
=0.4×25+0.4×2.5,
=10+1,
=11;
(4)4.95×[2.46÷(5.58-5.28)],=4.95×[2.46÷0.3],
=4.95×8.2,
=40.59;
(5)9.16-1.25-3.
16-2.75,=9.16-3.
16-1.25-2.75,=(9.
16-3.16)-(1.25+2.
75),=6-4,=2.
下面各題,能簡算的要用簡便方法計算.2.9+0.46+7.1+0.5430÷2.5+1.6×2.50.4×(
2樓:餅餅
(1)2.9+0.46+7.1+0.54,=(2.9+7.1)+(0.46+0.56),=10+1,
=11;
(2)30÷2.5+1.6×2.5,
=12+4,
=16;
(3)0.4×(25+2.5),
=25×0.4+2.5×0.4,
=10+1,
=11;
(4)4.97×[2.46÷(5.58-5.28)],=4.97×[2.46÷0.3],
=4.97×8.2,
=40.754.
下面各題能簡算的要用簡便計算.1.36+4.85+2.64+6.15 98.5÷2.5÷4 5.4÷[2.5×(3.7-2.9)]0.8×(4-3.6
3樓:□小千
(1)1.36+4.85+2.64+6.15,=(1.36+2.64)+(4.85+6.15),=4+11,
=15;
(2)98.5÷2.5÷4,
=98.5÷(2.5×4),
=98.5÷10,
=9.85;
(3)5.4÷[2.5×(3.7-2.9)],=5.4÷[2.5×0.8],
=5.4÷2,
=2.7;
(4)0.8×(4-3.68)÷0.01,=0.8×0.32÷0.01,
=0.256÷0.01,
=25.6;
(5)83.7-12.83-0.17,
=83.7-(12.83+0.17),
=83.7-13,
=70.7;
(6)5.96+13×(3.2-3.12),=5.96+13×0.08,
=5.96+1.04,=7.
計算下面各題.(能簡便的要用簡便方法計算)2.3+3.91÷(22-19.7)21.6÷[64.8-(48.6-2.7×2)]0.25×0
4樓:手機使用者
(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3
=2.3+1.7
=4(2)21.6÷[64.8-(48.
6-2.7×2)]=21.6÷[64.
8-(48.6-5.4)]=21.
6÷[64.8-43.2]
=21.6÷21.6
=1(3)0.25×0.03×4
=(0.25×4)×0.03
=1×0.03
=0.03
0.13×3.89+0.13×5.11
=0.13×(3.89+5.11)
=0.13×9
=1.17
(5)10.1×87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7
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