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56.7+98
=56.7+100-2
=156.7-2
=154.7
12.5×48×9
=(12.5×8)×(6×9)
=100×54
=5400
1/2×1/2×1/4×1/4
=1/4×1/4×1/4
=1/16×1/4
=1/64
79×17/78
=(78+1)×17/78
=78×17/78+17/78
=17+17/78
=17又17/78
3.2×87.5%÷1.6×8
=(3.2÷1.6)×(7/8×8)
=2×7
=14
4.8×101
=4.8×100+4.8
=480+4.8
=484.8
4.8×101-4.8
=4.8×(101-1)
=4.8×100
=480
0.875-1/4+1/8-1/4
=(0.875+1/8)-(1/4+1/4)
=1-1/2
=1/2
3.5÷1.4
=3.5÷0.7÷2
=5÷2
=2.5
0.875-3/4+1/8+1/4
=(0.875+1/8)-(3/4-1/4)
=1-1/2
=1/2
=56.7+100-2
=156.7-2
=154.7
12.5×48×9
=(12.5×8)×(6×9)
=100×54
=5400
1/2×1/2×1/4×1/4
=1/4×1/4×1/4
=1/16×1/4
=1/64
79×17/78
=(78+1)×17/78
=78×17/78+17/78
=17+17/78
=17又17/78
3.2×87.5%÷1.6×8
=(3.2÷1.6)×(7/8×8)
=2×7
=14
4.8×101
=4.8×100+4.8
=480+4.8
=484.8
4.8×101-4.8
=4.8×(101-1)
=4.8×100
=480
0.875-1/4+1/8-1/4
=(0.875+1/8)-(1/4+1/4)
=1-1/2
=1/2
3.5÷1.4
=3.5÷0.7÷2
=5÷2
=2.5
0.875-3/4+1/8+1/4
=(0.875+1/8)-(3/4-1/4)
=1-1/2
=1/2
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