
用用简便方法计算,要求写出简算的主要过程.①361-99 &...
用用简便方法计算,要求写出简算的主要过程.①361-99②0.7+3.8+4.2+9.3③35×14+35×34④(151-287)÷129+22÷51....
用用简便方法计算,要求写出简算的主要过程.①361-99 ②0.7+3.8+4.2+9.3③35×14+35×34 ④(151-287)÷129+22÷51.
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①361-99
=361-100+1
=261+1
=262;
②0.7+3.8+4.2+9.3
=(0.7+9.3)+(3.8+4.2)
=10+8
=18;
③
×
+
×
=
×(
+
)
=
×1
=
;
④(
-
)÷
+22÷51
=(
-
)×29+22÷51
=
-
+
=
+
-
=1-
=
;
故答案为262;18;
;
.
=361-100+1
=261+1
=262;
②0.7+3.8+4.2+9.3
=(0.7+9.3)+(3.8+4.2)
=10+8
=18;
③
3 |
5 |
1 |
4 |
3 |
5 |
3 |
4 |
=
3 |
5 |
1 |
4 |
3 |
4 |
=
3 |
5 |
=
3 |
5 |
④(
1 |
51 |
2 |
87 |
1 |
29 |
=(
1 |
51 |
2 |
87 |
=
29 |
51 |
2 |
3 |
22 |
51 |
=
29 |
51 |
22 |
51 |
2 |
3 |
=1-
2 |
3 |
=
1 |
3 |
故答案为262;18;
3 |
5 |
1 |
3 |
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