问题
解答题
|
答案
①32×18+3060÷36
=576+85,
=661;
②30
-25.7-4.31 4
=30
-(25.7+4.3),1 4
=30
-30,1 4
=
;1 4
③2.75+3
+10.2+14 5 1 4
=2.75+3.8+10.2+1.25,
=(2.75+1.25)+(3.8+10.2),
=4+14,
=18;
④7.8×3.4+7
+7.8×54 5 3 5
=7.8×3.4+7.8+7.8×5.6,
=7.8×(3.4+5.6+1),
=7.8×10,
=78;
⑤12×(
+1 4
-1 6
)1 3
=12×
+12×1 4
+12×1 6
,1 3
=3+2+4,
=9;
⑥[(4-1
)÷1.2+113 15
]÷21 3 1 3
=[
÷32 15
+6 5
]÷4 3
,7 3
=[
×32 15
+5 6
]×4 3
,3 7
=[
+16 9
]×12 9
,3 7
=
×28 9
,3 7
=
.4 3