计算(能简便要简便):13.65+32.47+17.52=78.14-31.43-18.57=143-15.28-84.72=53.27-8.4-3.27-1.6=(13.
计算(能简便要简便):13.65+32.47+17.52=78.14-31.43-18.57=143-15.28-84.72=53.27-8.4-3.27-1.6=(13...
计算(能简便要简便):13.65+32.47+17.52=78.14-31.43-18.57=143-15.28-84.72=53.27-8.4-3.27-1.6=(13.1-9.28)-(4.5-2.74)=56.65-(13.22+16.65)=
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①13.65+32.47+17.52
=46.12+17.52
=63.64;
②78.14-31.43-18.57
=78.14-(31.43+18.57)
=78.14-50
=28.14;
③143-15.28-84.72
=143-(15.28+84.72)
=143-100
=43;
④53.27-8.4-3.27-1.6
=53.27-3.27-(8.4+1.6)
=50-10
=40;
⑤(13.1-9.28)-(4.5-2.74)
=3.82-1.76
=2.06;
⑥56.65-(13.22+16.65)
=56.65-16.65-13.22
=40-13.22
=26.78.
=46.12+17.52
=63.64;
②78.14-31.43-18.57
=78.14-(31.43+18.57)
=78.14-50
=28.14;
③143-15.28-84.72
=143-(15.28+84.72)
=143-100
=43;
④53.27-8.4-3.27-1.6
=53.27-3.27-(8.4+1.6)
=50-10
=40;
⑤(13.1-9.28)-(4.5-2.74)
=3.82-1.76
=2.06;
⑥56.65-(13.22+16.65)
=56.65-16.65-13.22
=40-13.22
=26.78.
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