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1、1计 算 练 习班级: 姓名: 一、计算下面各题,能用简便方法计算的要简便计算1.25725 4 6.399 19 512 356 11.852.911.09 823998718 16 1118354-198 24( + - ) + 3248194513.76-817-3 1-(0.25+ )7.2 881.2517331247.23-(7.23+5.89) 5 ( )312515397312396( ) 1250.253.2 37204028386213420.5-28.37-1.63+9.5 ( + )5-13543(70.20.6-2.12)20 741195953二、求未知数 31.4
2、2= 1.1 1.6:= 0.5 : + = 778 14 135+ = 2.1 : =8:X 4X16=21.6834 14 1124+0.8 =100 2.5: =7.5:12 50% + =75 41=0.5: x + x =66 :4= : x x6.1832143145x0.615=18 x : = 3x + 52=4x-3.81657784x- x = 8 2.5-35=65 : =:32316 321+ =0.7 5+3%=10.5 : =X:24 215103 83109X-9= = 2X+4.53=14.552328.145x7X5 20 X = 3 2(X+3)=14.221918 90% X 80% X 80 2.5 X 33.85.142x5