(1)0.35-10-(0.2+6.37÷0.7)×0.5(2)91×131+9÷13-1÷13×100(3)(451-471)×17-371(4)53.5×1.9+61×1.25+41×8.1(5)12×[(12+13)÷56](6)79×1415+56×19+19×715.-数学
4 |
71 |
3 |
71 |
=
4 |
3 |
68 |
71 |
3 |
71 |
=
4 |
3 |
=
1 |
3 |
(4)53.5×1.9+61×1.25+41×8.1,
=53.5×(2-0.1)+(60+1)×1.25+(40+1)×8.1,
=53.5×2-53.5×0.1+60×1.25+1×1.25+40×8.1+1×8.1,
=107-5.35+75+1.25+324+8.1,
=(107+75+324)+(1.25-5.35+8.1),
=506+4,
=510;
(5)12×[(
1 |
2 |
1 |
3 |
5 |
6 |
=12×[
5 |
6 |
5 |
6 |
=12×1,
=12;
(6)
7 |
9 |
14 |
15 |
1 |
9 |
1 |
9 |
7 |
15 |
=
1 |
9 |
14 |
15 |
1 |
9 |
1 |
9 |
7 |
15 |
=(
98 |
15 |