1樓:手機使用者
①125×3.2×2.5,
=125×8×0.4×2.5,
=(125×8)×(0.4×2.5),
=1000×1,
=1000;
②3.6×10.1,
=3.6×(10+0.1),
=3.6×10+3.6×0.1,
=36+0.36,
=36.36;
③5.8×2.7+0.58×73,
=5.8×2.7+5.8×7.3,
=5.8×(2.7+7.3),
=5.8×10,
=58;
④3.6+6.4×1.8,
=3.6+11.52,
=15.12;
⑤(1.48+3.02)÷(3.6×0.5),=4.5÷1.8,
=2.5;
⑥(36.7-4.9)×101-31.8,=31.8×101-31.8,
=31.8×(101-1),
=31.8×100,
=3180.
遞等式計算(能簡便的要簡便運算)(1)25×0.32×2.5(2)1.25×6.78+25×3.47+125×0.0382(3)(2.44-
2樓:阿斯頓
(1)25×
制0.32×2.5
=25×0.04×4×2×2.5
=(25×0.04)×(4×2.5)×2
=1×10×2
=10×2
=20;
(2)1.25×6.78+25×3.
47+125×0.0382=1.25×6.
78+125×0.0382+25×3.47=125×0.
0678+125×0.0382+25×3.47=125×(0.
0678+0.0382)+25×3.47=125×0.
106+25×3.47
=25×0.53+25×3.47
=25×(0.53+3.47)
=25×4
=100;
(3)(2.44-1.8)÷0.4×20
=0.64÷0.4×20
=1.6×20
=32;
(4)5+10+15+20+25+30+…+95=5+95+10+90+15+85+20+80+25+75+30+70+35+65+40+60+45+55+50
=(5+95)+(10+90)+(15+85)+(20+80)+(25+75)+(30+70)+(35+65)+(40+60)+(45+55)+50
=100+100+100+100+100+100+100+100+100+50
=100×9+50
=900+50
=950.
脫式計算能用簡便計算的要簡算.(1)310+4.25+3.7+134(2)0.125×3.2×25(3)17×44+54×17(4)7.8÷
3樓:手機使用者
(1)3
10+4.25+3.7+134=3
10+3.7+4.25+13
4=(3
10+3.7)+(4.25+134)
=4+6
=10;
(2)0.125×3.2×25
=0.125×8×0.4×25
=(0.125×8)×版(權0.4×25)=1×10
=10;
(3)1
7×44+54×17=1
7×(44+54)=17
×98=14;
(4)7.8÷〔32×(1-5
8)+3.6〕
=7.8÷〔32×3
8+3.6〕
=7.8÷〔12+3.6〕
=7.8÷15.6
=0.5;
(5)5
6÷〔3
4×(79-1
3)〕=56
÷〔34×49
〕=56÷1
3=2.5.
遞等式計算,能簡便計算的一定要簡便計算.25×40.1 12.5×3.2 100.d8÷d (0.25+0.25+0.2
4樓:鄭雨328丶
(1)25×45.1
=25×(45+5.1),
=25×45+25×5.1,
=155+2.5,
=152.5;
(2)12.5×手.2
=12.5×5.8×4,
=15×4,
=45;
(手)155.t8÷t
=(tt+1.t8)÷t.
=tt÷t+1.t8÷t,
=11+5.22,
=11.22;
(4)(5.25+5.25+5.25)×4=手×(5.25×4),
=手×1,
=手;(5)5.84÷2.5÷5.4
=5.84÷(2.5×5.4),
=5.84÷1,
=5.84.
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