1樓:匿名使用者
命題6.4+4.32÷1.2
=6.4+3.6
=10 即為所求
6.4×7.4÷0.32怎樣簡便就怎樣算?
2樓:當代啟示錄
6.4×7.4÷0.32
=640÷32×7.4
=20×7.4
=2×74
=148
下面各題,能用簡便方法計算的用簡便方法計算:2.5×12.5×32 6.4÷2.5÷0.4 5.4×0.36+0.64×5.4 9
3樓:古玉紅
(1)2.5×12.5×32
=(2.5×4)×(12.5×8),
=10×100,
=1000;
(2)6.4÷2.5÷0.4
=6.4÷(2.5×0.4),
=6.4÷1,
=6.4;
(3)5.4×0.36+0.64×5.4
=5.4×(0.36+0.64),
=5.4×1,
=5.4;
(4)9÷0.75+9÷0.25
=12+36,
=48;
(5)17.2-0.71-0.29
=17.2-(0.71+0.29),
=17.2-1,
=16.2;
(6)8.6+1.4÷2.5
=8.6+0.56,
=9.16.
簡便計算: 1. 3.625÷5/32+6又2/5×3/8+6.4 2. 45÷5/8+1.6+4.4×1又3/5 3. 8/9×【3/4-(7/16-0.25)】
4樓:匿名使用者
1. 3.625÷5/32+6又2/5×3/8+6.4=3.625×32/5+
6.4×3/8+6.4×1
=3.625×6.4+6.4×0.375+6.4×1=6.4×(3.625+0.375+1)
=6.4×5
=322. 45÷5/8+1.6+4.
4×1又3/5=45×8/5+1.6×1+4.4×1.
6=45×1.6+1.6×1+4.
4×1.6=1.6×(45+1+4.
4)=1.6×50.4
=1.6×(50+0.4)
=1.6×50+1.6×0.4
=80+0.64
=80.64
3. 8/9×【3/4-(7/16-0.25)】=8/9×【3/4-(7/16-1/4)】=8/9×【3/4-7/16+1/4】
=8/9×【3/4+1/4-7/16】
=8/9×【1-7/16】
=8/9×9/16
=1/2
4. 6.3×29又4/5+2.98×37=6.3×29.8+2.98×37
=63×2.98+2.98×37
=2.98×(63+37)
=2.98×100
=298
5. 3.6×31又2/5+314×0.
63+3.14=3.6×31.
4+314×0.63+3.14=36×3.
14+3.14×63+3.14×1=3.
14×(36+63+1)
=3.14×100
=314
6. 72×61又3/10+73.8*2又4/5=72×61.3+73.8×2.8
=72×61.3+(72×1.025×2.8)=72×61.3+72×(1.025×2.8)=72×61.3+72×2.87
=72×(61.3+2.87)
=72×64.17
=4620.24
7. 1/5+51/5+501/5+5001/5+50001/5=1/5+10又1/5+100又1/5+1000又1/5+10000又1/5
=(10+100+1000+10000)+(1/5+1/5+1/5+1/5+1/5)
=11110+1
=11111
5樓:妙酒
1. 3.625÷5/32+6又2/5×3/8+6.4=3又5/8x32/5+32/5x3/8+6.4=(3又5/8+3/8)x6.4+6.4
=4x6.4+6.4
=(4+1)x6.4
=5x6.4
=322. 45÷5/8+1.6+4.4×1又3/5=45x8/5+8/5+4.4x8/5
=(45+1+4.4)x8/5
=(50+0.4)x8/5
=50x8/5+0.4x8/5
=80+0.64
=80.64
3. 8/9×【3/4-(7/16-0.25)】=8/9x(3/4-7/16+1/4)
=8/9x(1-7/16)
=8/9x9/16
=1/2
4. 6.3×29又4/5+2.98×37=6.3x29.8+29.8x0.1x37=29.8x(6.3+3.7)
=29.8x10
=298
5. 3.6×31又2/5+314×0.
63+3.14=3.6x31.
4+31.4x10x0.63+31.
4x0.1=31.4x(3.
6+6.3+0.1)
=31.4x10
=314
6. 72×61又3/10+73.8*2又4/5=72x61.3+73.8x2.8
=4413.6+206.64
=4620.24
7. 1/5+51/5+501/5+5001/5+50001/5=1/5+10又1/5+100又1/5+1000又1/5+10000又1/5
=10000+1000+100+10+1/5x5=11111
6樓:圍觀者
1.原式=3.625*(32/5)+(32/5)*0.375+32/5=(32/5)*(3.625+0.375+1)=(32/5)*5=32
2.原式=45*(8/5)+8/5+4.4*(8/5)=(8/5)*(45+1+4.4)=80.64
3.原式=8/9 *(3/4-7/16+1/4)=8/9 * 9/16=1/2
4.原式=6.3*29.8+2.98*37=2.98*(63+37)=2.98*100=298
5.原式=3.6*31.4+314*0.63+3.14=3.14*(36+63+1)=3.14*100=314
6.題沒抄錯吧
7.原式=1/5+10+1/5+100+1/5+1000+1/5+10000+1/5=11111
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