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2. 下面算式中错误的是(
A.$0÷ 36=0$
B.$36÷ 0=0$
C.$0× 36=0$
D.$36-0=36$
B
)。A.$0÷ 36=0$
B.$36÷ 0=0$
C.$0× 36=0$
D.$36-0=36$
答案
B
3.已知$a÷ b = c······ d$（$b$不等于0），则下面算式中错误的是(
A.$b× c + d = a$
B.$(a - d)÷ b = c$
C.$(a + d)÷ b = c$
D.$(a - d)÷ c = b$
C
)。A.$b× c + d = a$
B.$(a - d)÷ b = c$
C.$(a + d)÷ b = c$
D.$(a - d)÷ c = b$
答案
C
三、计算。
1.直接写出得数。
$15 + 36 =$
$55 + 0 =$
$233 + 25 × 4 =$
$64 ÷ 8 × 9 =$
$230 × 30 =$
$560 ÷ 80 =$
$0 × (54 - 38) =$
$(150 - 80) × 20 =$
1.直接写出得数。
$15 + 36 =$
$55 + 0 =$
$233 + 25 × 4 =$
$64 ÷ 8 × 9 =$
$230 × 30 =$
$560 ÷ 80 =$
$0 × (54 - 38) =$
$(150 - 80) × 20 =$
答案
51 55 333 72 6900 7 0 1400
2. 列竖式计算并验算。
405 + 397 =
624 - 352 =
705 - 456 =
302 × 24 =
575 ÷ 23 =
580 ÷ 35 =
405 + 397 =
624 - 352 =
705 - 456 =
302 × 24 =
575 ÷ 23 =
580 ÷ 35 =
答案
竖式略 802 272 249 7248 25 16……20
