计算下列各题,能简算的一定要简算。①4.28-3+2.4②0.9+0.1-0.9+0.1③98-(30.45+45.22)④0.9-0.2
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计算下列各题,能简算的一定要简算。
①4.28-3+2.4=1.28+2.4=3.68
②0.9+0.1-0.9+0.1=0.9-0.9+0.1+0.1=0+0.1+0.1=0.2
③98-(30.45+45.22)=98-75.67=22.33
④0.9-0.2+1.49=0.7+1.49=2.19
⑤8.75-(4.32+2.75)=8.75-4.32-2.75=8.75-2.75-4.32=6-4.32=1.68
⑥19.85-(4.85+3.14)=19.85-4.85-3.14=15-3.14=11.86
①4.28-3+2.4=1.28+2.4=3.68
②0.9+0.1-0.9+0.1=0.9-0.9+0.1+0.1=0+0.1+0.1=0.2
③98-(30.45+45.22)=98-75.67=22.33
④0.9-0.2+1.49=0.7+1.49=2.19
⑤8.75-(4.32+2.75)=8.75-4.32-2.75=8.75-2.75-4.32=6-4.32=1.68
⑥19.85-(4.85+3.14)=19.85-4.85-3.14=15-3.14=11.86
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