问题 解答题
四则运算,能简算的要简算.
(136-87)×15÷3
542×6+158×698×101
168+32÷8101×42-424.9+0.1-4.9+0.1
34.02+13.5+0.985.17-1.8-3.29.95-(4.95+3.14)
8.43+2.87+0.57+0.13.
答案

(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.

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