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①122-36+64
=122-(36+64)
=122-100
=22 訂正:①122-36+64,
=86+64,
=150;122-36+64,
=86+64,
=150;
②99×25
=(100-1)×25
=100-1×25
=75訂正:②99×25,
=(100-1)×25,
=100×25-25×1,
=2500-25,
=2475;99×25,
=(100-1)×25,
=100×25-25×1,
=2500-25,
=2475;
③720÷(8×3)
=720÷8×3
=90×3
=270 訂正:③720÷(8×3),
=720÷24,
=30.720÷(8×3),
=720÷24,
=30..
=86+64,
=150;
=86+64,
=150;
=(100-1)×25,
=100×25-25×1,
=2500-25,
=2475;
=(100-1)×25,
=100×25-25×1,
=2500-25,
=2475;
=720÷24,
=30.
=720÷24,
=30.
【考點】帶括號的表外乘加、乘減.
【答案】122-36+64,
=86+64,
=150;;99×25,
=(100-1)×25,
=100×25-25×1,
=2500-25,
=2475;;720÷(8×3),
=720÷24,
=30.
=86+64,
=150;;99×25,
=(100-1)×25,
=100×25-25×1,
=2500-25,
=2475;;720÷(8×3),
=720÷24,
=30.
【解答】
【點評】
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發(fā)布:2025/1/6 17:30:1組卷:15引用:3難度:0.7
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