简便计算及解方程
222×999+333×334 45×99 3(x+2)÷5=(x+2)
3(x+1)÷(2x﹣4)=6 7×( x﹣2 )=2x+3 .
540﹣70= 3×3×3= 5×4+4=
63÷(3×3 )= 72﹣2﹣30= 1800+900=
55÷5= 68﹣27﹣13= 86﹣(35﹣14)=
110+120+130+140+150+160+170+180+190=
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.
试题篮
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