47、原式=7/9÷(10/15-3/15)-(1/3)×16
=(7/9)×(15/7)-16/3
=5/3-16/3
=-11/3;
48、原式=8-36+4
=-24;
49、原式=(-5/8)×16-0.25×(-5)×(-64)
=-10-80
=-90;
50、原式=-27×(4/9)+16/3×(1/16)
=-12+1/3
=-11-2/3;
=-11又3分之2;
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47、原式=7/9÷(10/15-3/15)-(1/3)×16
=(7/9)×(15/7)-16/3
=5/3-16/3
=-11/3;
48、原式=8-36+4
=-24;
49、原式=(-5/8)×16-0.25×(-5)×(-64)
=-10-80
=-90;
50、原式=-27×(4/9)+16/3×(1/16)
=-12+1/3
=-11-2/3;
=-11又3分之2;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,