计算.(能简算的要简算)①34×1315+14×1315②(34+23+16)÷112③58×0.42+38×42%④35+34-35+34⑤6÷(12+13)⑥78×577.-数学
+
)÷
,
=(
+
+
)×12,
=
×12+
×12+
×12,
=9+8+2,
=19;
③
×0.42+
×42%,
=
×0.42+
×0.42,
=(
+
)×0.42,
=1×0.42,
=0.42;
④
+
-
+
,
=(
-
)+(
+
),
=0+
,
=
;
⑤6÷(
+
),
=6÷
,
=
;
⑥78×
,
=(77+1)×
,
=77×
1 |
6 |
1 |
12 |
=(
3 |
4 |
2 |
3 |
1 |
6 |
=
3 |
4 |
2 |
3 |
1 |
6 |
=9+8+2,
=19;
③
5 |
8 |
3 |
8 |
=
5 |
8 |
3 |
8 |
=(
5 |
8 |
3 |
8 |
=1×0.42,
=0.42;
④
3 |
5 |
3 |
4 |
3 |
5 |
3 |
4 |
=(
3 |
5 |
3 |
5 |
3 |
4 |
3 |
4 |
=0+
3 |
2 |
=
3 |
2 |
⑤6÷(
1 |
2 |
1 |
3 |
=6÷
5 |
6 |
=
36 |
5 |
⑥78×
5 |
77 |
=(77+1)×
5 |
77 |
=77×
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