下列各题能简算的要简算.
来源:学生作业帮 编辑:拍题作业网作业帮 分类:数学作业 时间:2024/04/20 04:29:41
下列各题能简算的要简算.
3.1+2.4+1.9+3.6 | 300-288÷24 | 48×(
(1)3.1+2.4+1.9+3.6,
=(3.1+1.9)+(2.4+3.6), =5+6, =11; (2)300-288÷24, =300-12, =288; (3)48×( 3 8+ 5 6), =48× 3 8+48× 5 6, =18+40, =58; (4)0.46×98+0.92, =0.46×(100-2)+0.92, =0.46×100-0.46×2+0.92, =46-0.92+0.92, =46; (5) 4 5× 2 5÷ 4 5× 2 5, =( 4 5÷ 4 5)×( 2 5× 2 5), =1×0.16, =0.16; (6)21÷( 1 3+ 2 5)÷ 9 11, =21÷ 11 15÷ 9 11, =21÷( 11 15× 9 11), =21÷ 3 5, =35. |