计算: ①3×(x+9)=27 ②16×8-7x=23 ③7.5-7.5×0.5
题型:解答题
问题:
计算:
①3×(x+9)=27
②16×8-7x=23
③7.5-7.5×0.5-2.6×0.8
④13.7×6.5+5.9×13.7-12.4×3.7
⑤50×[(0.2+4.8-4.8+0.2)÷2]
⑥11.25+21.25+31.25+41.25+51.25+61.25+71.25+81.25.
计算:
①3×(x+9)=27
②16×8-7x=23
③7.5-7.5×0.5-2.6×0.8
④13.7×6.5+5.9×13.7-12.4×3.7
⑤50×[(0.2+4.8-4.8+0.2)÷2]
⑥11.25+21.25+31.25+41.25+51.25+61.25+71.25+81.25.