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SIN 90 = SIN 30 =(-1)=45-99.9=25X(-0.4)=125X-8=1/2+3/1-=5除以(
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相关问题
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5X1.03X0.2、32X1.25、0.45X99、53X10.1、4.2X6.51+3.49X4.2、9.99X1.
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(1)125 - 25×6÷30 (2)( + )×45 (3)1.8+4.3+0.7+4.2 (4)8.3×9.9+8
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1: 9.4乘[1.28-(x-0.31)]=0.47 2: 45除以[9-(2x-28)]=9 3: 15(3x-8)
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求x:(1)9x²-25=0 (2)¼(x+3)²=9 (3)8x²+125=0
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(1)cos60°-sin^2 45°+sin^2 45°+1/4tan^2 30°+cos30°-sin30°
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化简比0.75:3/81又3/4:0.25 25:0.125 7/8:1/4 25%:3/5 45:30 3/5:1/6
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5.2 sin (45(x + 8°)) - 1 = -3,解x,答案用度表示
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怎样简便就怎样算:(1)7.9x0.25x40(2)0.76+99x0.76(3)18.32/8/0.125(4)0.8
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一道困扰N久的数学题...1/sin2x + 1/sin4x + 1/sin8x + 1/sin16x + 1/sin3
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1/2:1/5=1/4:x0.8:4=x:83/4:x=3:1236/x=54/32/9=8/x1.25:0.25=x: