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解比例:乄:3/8=6:1/4,0.4/4.8=乄/24,(1/3+1/4...

解:只要变成乘法,即两内项相乘=两外项相乘 0.8:x=1.2:4,1.2x=3.2, x=8/3≈2.67. 10:x=5:3分之4, 5x=10*4/3 , x=8/3≈2.67, 3分之x=24分之4.8, x=4.8/8=0.6, 1.8:5.4=X:5.7, 5.4x=1.8*5.7, x=5.7/3=1.9, 25:0.4=75:x, 25x=75*0.4, x=1.2, 2...

3.2+4.8=8 6.3-0.94=5.36 0.25×4=1 5×1.2=6 4.8÷0.6=8 4.8÷24=0.2 3.6-2.4=1.2 6-4.6=1.4 8-3.4=4.6 6×0.21=1.26 1.25×8=10 0.8÷0.5=1.6 25×0.3=7.5 0.63-0.3=0.33 2.5+7.5=10 34×0.1=3.4 7-0.99=6.01 21÷0.7=30 5×2.4=12 3×1.03=3.09 3.2÷4=0....

5.5×2=11 9.6÷4.8=2 3-1.5×2=0 2×3.1=6.2 2.4×0.5=1.2 0.125×8-0.1=0.9 0.48÷6=0.08 6.4-4=2.4 0.6÷3+3=3.2 0.91÷13=0.07 3.25+0.75=4 9.9-0.9÷0.1=0.9 2.5×3=7.5 4.4÷(5×0.2)=4.4 7×1.3=9.1 0.96÷0.06=16 0.36×0.3=0.108 0.35÷0.7=0.5 4×0.8...

=0.4×2.4÷1.2=0.4×2=0.8 =11.72-1.72-7.85=10-7.85=2.15 =0.8+2500÷32=0.8+2500÷4÷8=0.8+25×25÷8=4/5+625/8=(32+625×5)/40=3157/40

5.5×2=119.6÷4.8=23-1.5×2=02×3.1=6.22.4×0.5=1.20.125×8-0.1=0.90.48÷6=0.086.4-4=2.40.6÷3+3=3.20.91÷13=0.073.25+0.75=49.9-0.9÷0.1=0.917×40=680 100-63=37 3.2+1.68=4.884.8÷8=0.60.5+0.5÷0.5=1.550×0.8=400.99÷33=0.034×7.5×2.5=754.5×0.1...

0.02×0.1=0.002 5.06x-4.07x=0.99x 12-7.8=4.2 a+0.4a=1.4a 12÷0.3=40 4.6x+2.7x=7.3x 1.7+0.43=2.13 0.58a-0.47a=0.11a 1.5×0.4=0.6 4.8x-3.1x=1.7x 1.25×0.2=0.25 12a-8.4a=3.6a 64.32÷16=4.02 6x-4.9x=1.1x 5.1b+11.9b=17b 1.23÷3=0.41 100×...

①9/10-(2/5+1/4)=9/10-2/5-1/4=9/10-4/10-1/4=5/10-1/4=1/2-1/4=1/4 ②3-6/13÷9/26-2/3=3-6/13×26/9-2/3=3-4/3-2/3=3-2=1 ③1.05×(4.8-0.8)÷2.1=1.05×3÷2.1=1.05×(3÷2.1)=1.05×1/0.7=1.05÷0.7=1.5 ④(7/8-1/4)×(2/3-1/9)=(7/8-2/8)×(6/9...

(7)-7+3-6;(8)(-3)×(-8)×25;(13)(-...解:(1)(-3)×(-5)2=(-3)×25=-75.(2)...[2/3-4-1/4*(-0.4)]/1/3+222+(-4)+(...

2.5+3.2=5.7; 0.83-0.5=0.33; 0.25+0.75=1; 9.8-4.8=5; 1.7+0.4=2.1; 1-0.6=0.4; 1.2-0.8=0.4; 0.92-0.9=0.02; 0.52+0.4=0.92; 0.47-0.4=0.07.

解答:解:0.36+0.14=0.57.2-5.8=1.41-0.4=0.64.8+3.12=7.921-0.08=0.920.01+0.1=0.113.9+5.1=932÷100=0.326.8×10=6854.3÷100=0.5430.54×100=540.189×1000=189

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