1樓:娃娃
(zhi1)38.78-19.59+41.
22-30.41,=38.78+41.
22-19.59-30.41,=(38.
78+41.22)-(19.59+30.
41),dao=80-50,
=30;
(2)2.74×
回4.86+4.86×6.26+4.86,=(2.74+6.26+1)×
答4.86,
=10×4.86,
=48.6;
(3)0.08×(12.5+2.5)×0.1,=(0.08×12.5+0.08×2.5)×0.1,=(1+0.2)×0.1,
=1.2×0.1,
=0.12;
(4)25.92+(10.1-14.5×0.2),=25.92+(10.1-2.9),
=25.92+7.2,
=33.12;
(5)0.487×12.5÷48.7,
=0.487÷48.7×12.5,
=0.01×12.5,
=0.125;
(6)(8.16+2.09)÷[(10.3-9.3)÷0.4],=10.25÷[1÷0.4],
=10.25÷2.5,
=4.1.
用遞等式計算,能簡便的要用簡便方法計算,寫出必要的計算過程 7280-280×12 1650-78-222+350 1230÷
2樓:手機使用者
(1)7280-280×12,du
=7280-3360,zhi
=3920;
(dao2)1650-78-222+350,=(1650+350)-(78+222),版=2000-300,
=1700;
(3)1230÷6+15×13,
=205+195,
=400,;
(4)41×(982+760÷38),
=41×(982+20),
=41×1002,
=41082;
(5)1472÷[﹙2100-1364﹚÷權23],=1472÷[736÷23],
=1472÷32,
=46;
用遞等式計算,能簡便的要用簡便方法計算,寫出必要的計算過程 7280-280×12 1650-78-222+350 1230
3樓:手機使用者
(zhi1)dao7280-280×12,版=7280-3360,
=3920;
(2)1650-78-222+350,
=(1650+350)-(78+222),=2000-300,
=1700;
(3)1230÷6+15×13,
=205+195,
=400,;
(4)41×(權982+760÷38),
=41×(982+20),
=41×1002,
=41082;
(5)1472÷[﹙2100-1364﹚÷23],=1472÷[736÷23],
=1472÷32,
=46;
用遞等式計算(寫出必要的計算過程,能簡便用簡便方法計算)(1)45.07+(4.93+8.62)(2)12.5×(80+0.
4樓:鵲橙尤
(1)45.07+(4.93+8.62),=45.07+13.55,
=58.62;
(2)12.5×(80+0.8),
=12.5×80+12.5×0.8,
=1000+10,
=1010;
(3)34.26+47.7-55.3+2.53,=34.26+(47.7+2.53)-55.3,=34.26+50.23-55.3,
=84.49-55.3,
=29.19;
(4)13.2-180÷45×2.6,
=13.2-4×2.6,
=13.2-10.4,
=2.8;
(5)4.7×2.4+0.
47×58+0.18×47,=4.7×2.
4+4.7×5.8+1.
8×4.7,=4.7×(2.
4+5.8+1.8),
=4.7×10,
=47;
(6)8.9+30.1÷[(5.04+3.56)×0.7],=8.9+30.1÷[8.6×0.7],
=8.9+30.1÷6.02,
=8.9+5,
=13.9.
用遞等式計算.(能簡便的就用簡便方法計算)(1)684+37+316+63(2)147×56+147×45-147(3)25×125×
5樓:嘉慄華
(1)684+37+316+63
=684+316+(37+63)
=1000+100
=1100;
(2)147×56+147×45-147
=147×(56+45-1)
=147×100
=14700;
(3)25×125×24×16
=25×16×(125×24)
=400×3000
=1200000;
(4)81+791×9
=9×9+791×9
=(9+791)×9
=800×9
=7200;
(5)(62×125+125×26)÷22=(62+26)×125÷22
=88×125÷22
=88÷22×125
=4×125
=500;
(6)125×[920÷(750-727)]=125×[920÷23]
=125×40
=5000.
用遞等式計算,能簡便的要用簡便方法計算
6樓:不明
(1)(1.7+0.8)÷
bai1.25×
du0.8
=2.5÷1.25×zhi0.8
=2×0.8
=1.6;
(dao2)32.55-14.64-6.36+7.45=(32.55+7.45)-(14.64+6.36)=40-21
=19;
(3)(3.72+0.48)÷[(2-0.6)×1.5]=4.2÷[1.4×1.5]
=4.2÷2.1
=2;(4)38×2.8-2.8+2.8×63=(38-1+63)×2.8
=100×2.8
=280;
(5)9.8÷[(19.7-(4.5+2.9)×2]=9.8÷[(19.7-7.4×2]
=9.8÷[(19.7-14.8]
=9.8÷4.9
=2;(6)(25+2.5+1.25)×4=25×4+2.5×4+1.25×4
=100+10+5
=110+5
=115.
用遞等式計算能簡便計算的用簡便方法計算
1 53.2 6.3 6.3 0.7,53.2 6.3 9,50.5 2 2.5 0.25 0.025 4,2.5 4 0.25 4 0.025 4,10 1 0.1,8.9 3 50 16.9 13 0.6,50 1.3 0.6,48.7 0.6,29.22 4 1.25 0.8 4 25,1.2...
遞等式計算,能簡便的要簡便 4
4 25 99 4 25 4 25 99 1 4 25 100 4 4 16.99 1 x4 25 4 25 100即100個4 25 1 25 32 0.25 25 4 2 4 0.25 25 4 版 4 0.25 2 100 1 2 200 2 0.25 0.4 40 0.25 0.4 40 0...
用遞等式計算,寫出必要的計算過程,能簡便運算的要用簡便方法計
100 870 29 88 100 30 88 18 15 7.5 4.6 6.6 2 4.6 6.6 6.6 6.6 0 3.5 64 12.5 3.5 8 內 8 12.5 28 100 2800 容51 7.5 49 7.5 1 51 49 7.5 1 2 7.5 1 15 1 14 4 4....