练习题姓名------------X+X=21X+X=3.6X÷2=2.16χ-χ=83X+X=+X=χ+2.4χ=60.8X-4=1.615X÷2=606×3-1.8χ=7.217-5χ=2.4+32χ+4.3×3=14χ×(1-)=13÷4χ=23χ+χ=2131-χ=89.2χ-χ+=χ-χ=7(6.5+x)=87.5(x-3)÷2=7.513.2x+9x=33.33x=x+100×-χ=简便运算:7/12×6+5/12×62/9-7/16×2/92/5×4×3/41/2×1/+15+1/3×1/25/6×5/9+5/9×1/6(8/9+4/27)×2787×3/86(1/5+2/3)×154/7×5/9+3/7×5/95/18×1/4×9/10(1/4+2/9)×367/11×3/8×4/9(5/8+5/6)×4/255/7+5/6+2/7+1/61/15×(1/3+1/12)1/4÷(3-5/13-8/13)4/9÷【5/6-(1/6+1/3)】(2/3+3/4)×243/4×6/7+1/7×3/4(5/12+3/8-1/4)×242/9×(120×9)×1/24