把下面百分数化成小数或整数。52%= 1.23%= 248%= 70%=0.4%= 15%= 100%= 2000%=
估算:705500-50800≈5035433-205000≈305500-108900≈805433+205000≈855500-579900≈533533-205130≈
估算:905500-500900≈403553-205000≈505500-408900≈703543-205050≈803033-205010≈805500-508900≈
估算:117÷2≈ 124÷2≈153÷5≈ 122÷5≈
估算:252÷2≈ 247÷2≈357÷5≈ 334÷2≈
口算:150÷6= 216÷9=272÷8= 336÷8=