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
=32
2. 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
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
=32
2. 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
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.题没抄错吧
7.原式=1/5+10+1/5+100+1/5+1000+1/5+10000+1/5=11111