①2.5×99+2.5
②
③
④
36×25%=
12.6÷3=
7.3﹣3=
23×489≈
9.1+0.09=
①2x﹣4×0.5=4
②:=x:
①1.25×2.8﹣31.5÷15
② × ÷ +
① ÷ + ×33
② ﹣[( +0.5)÷ ]
③解比例:x: = :
①(826-370)÷38×5
②×[÷(-)]
③1.82+0.28+39.5×0.8
217﹣18= ×= 3÷= 0.78+0.32=
32﹣0.25= 3﹣= 200×3.6= +×5=