9+5859+8 42-2531-25 45+555
6×792-41 一刻半小时 3米+5厘米8米
9×1+9=9×2=18
9×2+9=9×3=27
9×3+9=9×4=36
……
9×6+=×=63
6×68×5 73+88×9 7×99×4+3×9
算式:×+=粒
= 10÷1%= 5.6÷2= 1×7=
= = 1﹣= 5×÷5×=