四则运算,能简算的要简算.(136-87)×15÷3 542×6+158×6 &n...

2024-11-16 21:50:56
推荐回答(1个)
回答1:

(1)(136-87)×15÷3 
=49×15÷3
=735÷3
=245;

(2)542×6+158×6
=(542+158)×6
=700×6
=4200;

(3)98×101    
=98×100+98×1
=9800+98
=9898;

(4)168+32÷8
=168+4
=172;

(5)101×42-42
=(101-1)×42
=100×42
=4200;

(6)4.9+0.1-4.9+0.1
=4.9-4.9+(0.1+0.1)
=0+0.2
=0.2;

(7)34.02+13.5+0.98
=34.02+0.98+13.5
=35+13.5
=48.5;

(8)5.17-1.8-3.2 
=5.17-(1.8+3.2)
=5.17-5
=0.17;

 (9)9.95-(4.95+3.14)
=9.95-4.95-3.14
=5-3.14
=1.86;

(10)8.43+2.87+0.57+0.13
=8.43+0.57+(0.13+2.87)
=9+3
=12.