1.算一算。
(64−52)÷6=
(106−42)÷8=
(131−82)÷7=
(36−32)÷2=
(45−37)÷2=
2×(38−32)=
5×(45−37)=
(55−20)÷7=
8×(63−61)=
2×(22−16)=
3×(52−44)=
(52−22)÷6=
(36−16)÷5=
4×(40−32)=
6×(24−20)=
(44−28)÷2=
5×(64−61)=
(39−34)÷5=
(33−12)÷3=
(49−43)×5=
(32−18)÷7=
4×(73−70)=
45−(22+10)=
(43−35)÷4=
6×(54−48)=
48+(41−22)=
164−(24+36)=
(26−14)÷3=
90−(76+12)=
189+(41−30)=

2
8
7
2
4
12
40
5
16
12
24
5
4
32
24
8
15
1
7
30
2
12
13
2
36
67
104
4
2
200

2.脱式计算。
• (22-4)÷2 • 9×(79-76) • (12+2)÷7 • 6÷(32-26)
• (74-70)×7 • 108-(36+24) • 5×(101-92) • (100-64)÷6

(22-4)÷2
=18÷2
=9
9×(79-76)
=9×3
=27
(12+2)÷7
=14÷7
=2
6÷(32-26)
=6÷6
=1
(74-70)×7
=4×7
=28
108-(36+24)
=108-60
=48
5×(101-92)
=5×9
=45
(100-64)÷6
=36÷6
=6

3.下面的计算正确吗？把不正确的改正过来。
(50-20)÷5
=50-4
=46
224-(24+76)
=200+76
=276

(50-20)÷5改正：(50-20)÷5
=30÷5
=6
224-(24+76)改正：224-(24+76)
=224-100
=124