1.下面各题第一步算什么?先画线,再计算。
140 - 80 - 36
=○
=
3×3×7
=○
=
9×2÷6
=○
=
140 - 80 - 36
=○
=
3×3×7
=○
=
9×2÷6
=○
=
答案
140-80-36
$\underline{140-80}$
=60-36
=24
3×3×7
$\underline{3×3}$
=9×7
=63
9×2÷6
$\underline{9×2}$
=18÷6
=3
$\underline{140-80}$
=60-36
=24
3×3×7
$\underline{3×3}$
=9×7
=63
9×2÷6
$\underline{9×2}$
=18÷6
=3
2.下面的计算正确吗?正确的在(
62-26+14
=62-40
=22(
32÷4×2
=32÷8
=4(
×
)里画“√”,错误的画“×”并改正过来。62-26+14
=62-40
=22(
×
)32÷4×2
=32÷8
=4(
×
)答案
62-26+14改正:
=36+14
=50
32÷4×2改正:
=8×2
=16
=36+14
=50
32÷4×2改正:
=8×2
=16
3.计算。
75 + 19 - 48
54 ÷ 6 ÷ 3
18 ÷ 3 × 8
75 + 19 - 48
54 ÷ 6 ÷ 3
18 ÷ 3 × 8
答案
(计算过程略)
75+19-48=46
54÷6÷3=3
18÷3×8=48
75+19-48=46
54÷6÷3=3
18÷3×8=48
4.在○里填上“>”“<”或“=”。
65-30+12 ○40
93-40-13 ○43
3×8÷6 ○4
6×6÷9 ○5
47+13-20 ○47-20+13
48÷6×3 ○48÷6×2
65-30+12 ○40
93-40-13 ○43
3×8÷6 ○4
6×6÷9 ○5
47+13-20 ○47-20+13
48÷6×3 ○48÷6×2
答案
> < = < = >
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