简便计算下面各题.1.29+3.7+0.71+6.3
简便计算下面各题.1.29+3.7+0.71+6.328.2-19.775.8-(15.3+5.8)23.4-8.54-1.4619×36-36×9879×102....
简便计算下面各题.1.29+3.7+0.71+6.3 28.2-19.7 75.8-(15.3+5.8) 23.4-8.54-1.46 19×36-36×9 879×102.
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(1)1.29+3.7+0.71+6.3, =(1.29+0.71)+(3.7+6.3), =2+10, =12; (2)28.2-19.7, =28.2-(20-0.3), =28.2-20+0.3, =18.2+0.3, =18.5; (3)75.8-(15.3+5.8), =75.8-15.3-5.8, =75.8-5.8-15.3, =70-15.3, =54.7; (4)23.4-8.54-1.46, =23.4-(8.54+1.46), =23.4-10, =13.4; (5)19×36-36×9, =36×(19-9), =36×10, =360; (6)879×102, =879×(100+2), =879×100+879×2, =87900+1758, =89658. |
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